You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today from my end?

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

ASSISTANT: Sure, I am here to help you out. Please provide me your name to check he reservation status on your name.

USER: I am Anthony Carter.

ASSISTANT: Sorry Anthony Carter, there is no active reservation on your name in our database.

USER: Not a big deal, anyhow thank you very much for your service.

ASSISTANT: Thank you for reaching us.