You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you now?

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

ASSISTANT: Ok, may I know your name to check with your reservation status?

USER: I am Richard Wilson.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: I am very apologetic to tell you, there is no active reservation found by your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.