You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kathleen Thompson.

ASSISTANT: How may I render you today?

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

ASSISTANT: Sure. Please wait, I will check with reservation list and revert to you.

USER: Sure.

ASSISTANT: Thanks for your time, but no reservation was done on your name to proceed further.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us, Have a nice day.

USER: Thanks for your information.