You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Raymond Adams. I want to change my existing reservation due to postpone of my exams, can you help me with that?

ASSISTANT: Sure, I am here to solve your problem. Please allow me a moment to check whether any reservation is found on your name or not.

USER: Sure, take your time.

ASSISTANT: Sorry  Raymond Adams, there is no reservation found on your name in our database.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.