You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: As my exam got postponed, I want to change my existing reservation. Can you help me out?

ASSISTANT: Sure, we are here to help you. May I know your name to check the reservations on your name?

USER: Sure, my name is Laura Lewis.

ASSISTANT: Ok, wait for some time.

USER: Ok.

ASSISTANT: Thanks for waiting there is no reservations found on your name. Thanks for choosing us.

USER: That's ok, thank you.