You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Betty White here. Please change my existing reservation to new locations.

ASSISTANT: Sure, I will help you in changing the reservation.

USER: Thank you.

ASSISTANT: May I know your travelling dates please? Sorry, please wait a moment. There are no reservations found on this name.

USER: It's ok, thanks for your service.

ASSISTANT: Thank you for approaching us.