You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My holiday vacation has been postponed, can you please help me for changing the existing reservation?

ASSISTANT: Sure, can I have your name to check the reservation status?

USER: Sure, my name is Kimberly Williams.

ASSISTANT: There is no reservation found under your name in our records.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.