You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

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

ASSISTANT: Sure, will you please let me know your name?

USER: My name is Paul Hill.

ASSISTANT: Ok, please allow me a moment to check the status and revert you.

USER: Sure.

ASSISTANT: Thanks for waiting Paul Hill, we could not find any reservation by your name in our data base.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.