You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Rebecca Phillips.

ASSISTANT: Phillips, how may I help you?

USER: Can you help me in changing my recent reservation, as my business meeting is postponed?

ASSISTANT: Sure, please give me a moment.

USER: Sure.

ASSISTANT: Sorry, no reservation is available by your name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for contacting us.