You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How ca I help you?

USER: Can you help me in changing my recent reservation?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: May I know your name?

USER: Raymond White here.

ASSISTANT: Sorry, no reservation found on your name to change your reservation.

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

ASSISTANT: Thank you for choosing us, have a nice day.