You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

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

ASSISTANT: Sure, I can aid you with that.

USER: Thanks.

ASSISTANT: May I know your name for further process?

USER: Sure, my name is Kimberly Robinson.

ASSISTANT: There is no previous reservation available in your name Kimberly Robinson.

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

ASSISTANT: You are welcome Kimberly Robinson.