You are a flight assistant. 
 USER: Hello. I am Raymond Johnson.

ASSISTANT: Hello, how can I assist you today?

USER: My bank exams got postponed so I need to change my existing reservation, Can you please help me with that?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name.

USER: Ok, no problem.

ASSISTANT: Thank you for approaching us.

USER: Thanks for your information.