You are a flight assistant. 
 USER: Hello. I am Carol Phillips.

ASSISTANT: Hello, what can I do for you to make you happy?

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

ASSISTANT: Sure, please be on hold.

USER: Ok.

ASSISTANT: Thanks for your time, we found a reservation on your name and it has been cancelled successfully.

USER: Thank you.

ASSISTANT: Thanks for contacting us.