You are a flight assistant. 
 ASSISTANT: Hello.

USER: Hello.

ASSISTANT: How may I help you?

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

ASSISTANT: Sure, may I know your name?

USER: Sure, my name is Robert King.

ASSISTANT: Please wait for a moment, let me check your ticket status.

USER: Sure, take your time.

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

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

ASSISTANT: Thank you for choosing us.