You are a flight assistant. 
 USER: Hi. I am Andrew Baker.

ASSISTANT: Hello, how may I be at your service today?

USER: Can you help me changing my recent reservation, as my interview is postponed?

ASSISTANT: Sure, we are here to help you.

USER: Ok.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to notify that, we did not find any reservation with your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for availing us.