You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I support you?

USER: I am Christine Edwards. I want to change my existing reservation due postpone of my exams so, can you help me in changing my reservation?

ASSISTANT: Sure. Give me a moment, I will check your reservation.

USER: Sure.

ASSISTANT: Thank you for your time. There is no reservation found on your name.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for contacting us.