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 am happy to help you with that.

USER: Thanks.

ASSISTANT: Can I have the name on which you reserved ticket earlier?

USER: Sure, my name is Virginia Scott.

ASSISTANT: Ok, please wait a moment and I will check the reservation status.

USER: Ok.

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

USER: Oh! It's ok no problem. Thank you for your information.

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