You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you now?

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

ASSISTANT: Ok, I will help you in changing the reservation. May I know your good name?

USER: Sure, my name is Timothy Walker.

ASSISTANT: Please, wait a minute.

USER: Sure.

ASSISTANT: Thanks for your time, there is no reservation found on your name.

USER: No problem, thanks for your support.

ASSISTANT: Thank you for opting us.