You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Rebecca Parker. I want to change my existing reservation. Could you help me with that?

ASSISTANT: Please wait a moment, I will let you know the status of your reservation.

USER: Ok.

ASSISTANT: There is no flight reserved on your route to change it. Thanks for choosing us.

USER: Thank you.