You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I want to change my existing reservation, as my exams got postponed. Can you please help me out out with it?

ASSISTANT: May I know your name?

USER: Sure, my name is Joseph Miller.

ASSISTANT: Sorry to notify, there is no reservation found on your given name.

USER: Ok, not a big problem. Anyways, thank you for the information.

ASSISTANT: Thank you for reaching us.