You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I want to change my existing reservation due to postpone of my exams. Can you help me in that?

ASSISTANT: Sure, may I know your name?

USER: Myself Eric Edwards.

ASSISTANT: Sorry, there is no active reservation on your name.

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

ASSISTANT: Thank you.