You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I have to change my previous flight ticket booking due to some important meeting, can you help me in ticket modification?

ASSISTANT: Sure, I am glad to help you with that.

USER: Thank you.

ASSISTANT: Can I know your name to check your reservation?

USER: Sure, my name is Mary Mitchell.

ASSISTANT: Please wait a moment to check.

USER: Sure, take your time.

ASSISTANT: We regret to inform you that, there is no reservation on your name in our records.

USER: Ok, no issue with that one. I think it is not booked properly, thank you for your help.

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