You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I postponed my vacation, can you please help me out in changing the reservation?

ASSISTANT: I can help you with that. Could you please provide your name to proceed further?

USER: Sure, I'm Jeffrey Phillips.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: OK, It's fine.

ASSISTANT: Thank you for contacting.

USER: Thank you for your help.

ASSISTANT: Have a nice day.