You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: As my exam got postponed, can you help me to change my existing reservation?

ASSISTANT: Sure, I am here to help you out. Please provide me your name to check the reservation details.

USER: Sure, my name is Pamela Lewis.

ASSISTANT: Sorry Lewis, there is no reservation on your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.