Apology Letters for Standing Someone up

Dear [Name],

I want to start off by expressing my sincerest apologies for my absence. I understand that my absence has caused a disruption in the team and I take full responsibility for my actions.

I know that I should have informed you of my absence ahead of time, but I was unable to do so due to [reason]. I understand that this was not an acceptable excuse and I am deeply sorry for the inconvenience caused.

I am aware that my absence has caused a lot of disruption in the team and I understand that this is not acceptable. I am willing to do whatever it takes to make up for the time that I have missed and I am committed to making sure that this does not happen again.

I am also willing to take on extra tasks and responsibilities in order to make up for the time that I have missed. I understand that this may be an inconvenience for the team, but I am willing to do whatever it takes to make up for my absence.

Once again, I apologize for my absence and I am committed to making sure that this does not happen again. I understand that my absence has caused a disruption in the team and I am willing to do whatever it takes to make up for it.

Sincerely,
[Your Name]

Dear {Recipient},

I'm sorry for not texting back right away {last night/yesterday/etc.}. Please know that I would never ignore you on purpose. I had simply {forgotten to check my phone/fallen asleep/etc.} and read your message just now.

For urgent matters, please call instead of texting. You may also reach me at {landline number}.

Best,
{Your Name}

Dear [Name],

I am writing to apologize for not fulfilling my commitment to you. I understand that I have let you down, and I am truly sorry for my actions.

I know that I had promised to [describe commitment], and I regret that I was not able to deliver on my promise. I understand that this was a commitment that I had made to you, and I should have taken it more seriously. I take full responsibility for my actions, and I apologize for not living up to my word.

I know that this has caused you a great deal of frustration and disappointment, and I am truly sorry for that. I understand that I have caused you to lose trust in me, and I am deeply sorry for that. I will do my best to make it up to you.

I understand that words are not enough to make up for what I have done, and I am willing to do whatever it takes to make it up to you. I am willing to [describe action], and I am also willing to [describe action]. I hope that these actions will help to make up for my mistake.

Once again, I apologize for not fulfilling my commitment to you. I understand that I have let you down, and I am truly sorry for my actions. I will do my best to make it up to you.

Sincerely,

[Your Name]