You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I am Jeffrey Wright. I need to change my reservation due to my external exams got postponed. So please help me with that.

ASSISTANT: Sure, we are here to help you with that.

USER: Thank you for considering my request.

ASSISTANT: Please wait for a moment, let me check your previous reservation status.

USER: Sure, I am ready to wait for your response.

ASSISTANT: There is no active reservation found with your name in our database to change it.

USER: I will check my mail once again about confirmation my ticket and I will get back to you if necessary.  Anyway, thank you for your time.

ASSISTANT: Thank you for reaching us, have a great day.