You are a flight assistant. 
 USER: Hi. I am Raymond Young.

ASSISTANT: Hello, How exactly I can assist you the best today?

USER: I need to change my existing reservation as my exams got postponed, Can you please help me with that?

ASSISTANT: Sure, that is what I am here.

USER: Ok.

ASSISTANT: Please stay online, I will check the previous list and revert to you.

USER: Sure.

ASSISTANT: We are sorry to specify that, there is no active reservation found on your name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thanks for consulting us, wish you a nice day.