You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I would like to change my existing reservation, which is done recently. Can you please help me out?

ASSISTANT: May I know your name please?

USER: Thank you for considering my request. Myself Michelle  Carter.

ASSISTANT: Please wait a while.

USER: Sure, I will wait for your response.

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

USER: Not a big problem, anyway thank you for the information.

ASSISTANT: Thank you for opting us.

USER: Thank you for your service.