You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I want to change my reservation, due to some problems I am unable to travel those dates, can you please change my reservation?

ASSISTANT: Sure, I will help you with that.

USER: Thanks.

ASSISTANT: Can I have your name to check reservation status?

USER: Sure, my name is Rachel King.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry King, no reservation found under your name to change.

USER: Oh! May be I am not booked my ticket properly at that time. Thank you for your information.

ASSISTANT: Thank you for choosing us, have a good day.