You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: As there is a change in our holiday plan, I would like to cancel my recent reservation.

ASSISTANT: Sure, can I know your name?

USER: My name is Charles Lewis.

ASSISTANT: Sorry Charles, there are no reservations with your name.

USER: Thank you for your help.

ASSISTANT: Thank you, have a good day.