You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I abet you today?

USER: I made a reservation earlier in the wrong date unknowingly so, can you please change my existing reservation?

ASSISTANT: Sure, may I know your good name to check the reservation on your name?

USER: My name is Benjamin Nelson.

ASSISTANT: I regret that there is no reservation found on your name.

USER: Ok, not an issue. Thanks for helping me.

ASSISTANT: Thank you for making us to serve you.