You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Betty Jones here. I would like to change my existing reservation, which is done recently. Can you please help me out in changing my reservation?

ASSISTANT: Sure, I am here to help you.

USER: Than you for considering my request.

ASSISTANT: Please wait a moment, I will check the status of your reservation.

USER: Sure, I will wait for your response.

ASSISTANT: Betty Jones, no reservation has been found on your name in our database.

USER: That's ok, no problem. Anyway, thank you for the information.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your kind service.