You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you at this moment?

USER: I made a reservation earlier in the wrong date unknowingly. Can you please change my existing reservation?

ASSISTANT: Yes, I will definitely try my best to help you in changing your existing reservation. Please, share me your good name to check your reservation status.

USER: Sure, I am Gary Robinson.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry to say that, we have not found any active reservation on your name in our database.

USER: Ok, Thank you for your service.

ASSISTANT: Thank you for opting us.