You are a flight assistant. 
 USER: Hello, I am Thomas Martin.

ASSISTANT: Hello, we are gladly here at your service.

USER: As my interview got postponed, Can you please change reservation?

ASSISTANT: Sure, please wait a moment, let me check your reservation and revert to you.

USER: Ok.

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

USER: Ok. Thank you.

ASSISTANT: Thanks for your interest, have a nice day.