You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Betty Moore here. I had booked a reservation to New York, but now I want to visit Washington. Can you help me with changing my reservation?

ASSISTANT: Please wait a while.

USER: Ok, sure.

ASSISTANT: Sorry to say, there is no reservation on your name in our database.

USER: Oh! That's very sad to know. Anyways, thank you for checking.

ASSISTANT: Thank you for opting us.

USER: You are most welcome.