You are a flight assistant. 
 USER: Hi, I am Betty Lewis.

ASSISTANT: Hello, how may I help you?

USER: I made a reservation earlier on the wrong date unknowingly. So, I want to change my existing reservation.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry there is no reservation found on your name.

USER: That's ok, no problem.

ASSISTANT: Thank you for opting us, have a good day.

USER: Thanks for your support.