You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Can you change my flight reservation?

ASSISTANT: Sure, May I know your name for checking the reservation?

USER: I had like to change my booking, as I was going to visit South mountain park, in Phoenix. For a business meeting. I am Sandra Williams.

ASSISTANT: Thank you for providing your name. Please wait a while, I will check and get you back. Thank you for waiting, We found no existing reservation with your name to change it. Thank you for choosing us, Have a nice day ahead.