You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Please let me know, what kind of service your looking for?

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

ASSISTANT: Sure, please share me your good name.

USER: I am Jerry Carter.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: Ok, no issues.

ASSISTANT: Thank you for opting us.

USER: Thank you for your help.