You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Due to some entrepreneurship meeting, I am going to change my existing reservation. Can you please help me in changing the reservation?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: may I know your name please to check the status of your reservation?

USER: I am James Roberts.

ASSISTANT: James Roberts, no reservation has been found on your name in our database.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.