You are a flight assistant. 
 USER: Hi, I am Christopher Thomas.

ASSISTANT: Hello, how  may I help you?

USER: I would like to change my reservation due to post pone of my brother's engagement. Please help me with it.

ASSISTANT: Sure, I am here to help you. Please stand by I will get back to you.

USER: Ok.

ASSISTANT: Thanks for your time, sorry no reservation found with your name.

USER: Thank you for the information.

ASSISTANT: Thank you for reaching us, have a nice day.