You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I have to change  my reservation due to my planned event got postponed. So please help me with that.

ASSISTANT: Sure, I am here to help you for this. May I know your name please?

USER: Thank you. Myself Barbara Jones.

ASSISTANT: Please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry for inconvenience, no reservation is found under your name to change.

USER: Oh! It may not be booked properly. Anyway, thank you for your time.

ASSISTANT: Thank you very much for approaching our agency.

USER: Most welcome.