You are a flight assistant. 
 USER: Hello. I'm Frank Davis.

ASSISTANT: Hello, how may I assist you?

USER: My scheduled examination dates has been postponed. So, I would like to change my reservation which is under my name. Can you please help me with that?

ASSISTANT: Sure, I will help you with the change of flight reservation.

USER: Thank you.

ASSISTANT: Thanks for waiting. But I am sorry to say that there is no reservation on your name.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you.

USER: You are welcome.