You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I made a reservation earlier, due to some personal work I want to make few changes in my existing reservation.

ASSISTANT: Ok. I will help you in that. May I have your name?

USER: Sure, I am Karen Taylor.

ASSISTANT: Please wait for sometime.

USER: Sure.

ASSISTANT: Thanks for your time, but no reservation is available on your name in our database.

USER: Ok, Thank you for your service.

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