You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I serve you at this moment?

USER: Can you please help me in changing my existing reservation, as my exam got postponed.

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your name to check your reservation status?

USER: Myself, Joshua Davis.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry to inform you that, we did not find any reservation against your name.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you for opting us.