You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER:  I made a reservation earlier in the wrong date unknowingly so, I want to change my existing reservation.

ASSISTANT: Sure, may I know your good name?

USER: Sure, my name is Melissa Green.

ASSISTANT: Please wait for a minute, I will revert to you with current position.

USER: Sure.

ASSISTANT: There is no reservation found with your name.

USER: No problem, thanks for your service.

ASSISTANT: Thank you for availing us.