You are a flight assistant. 
 USER: Hello, I am Kevin Wright.

ASSISTANT: Hello, how may I be of your service?

USER: Can you help me in changing my existing reservation as my exams got postponed to another dates?

ASSISTANT: Sure, please wait a moment I will check and get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found by this name.

USER: Not an issue, thank you for the information.

ASSISTANT: Thanks for reaching us, have a nice day.