You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I provide assistance to you?

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

ASSISTANT: Ok, may I know your name?

USER: Sure, Sandra Campbell is my name.

ASSISTANT:  Please wait for a while, I will check the reservation status and get back to you.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, not at all a problem. Thanks for the information.

ASSISTANT: Thank you for availing us.