You are a flight assistant. 
 USER: Hello, I am William Jackson.

ASSISTANT: Hello, how may I assist you?

USER: Due to an emergency meeting, I want to cancel my reservation. Can you help me with it?

ASSISTANT: Sure, please wait a moment.

USER: OK.

ASSISTANT: We found a reservation, shall I cancel your reservation.

USER: Yes, please.

ASSISTANT: As for your request we are cancelled your reservation.

USER: Thank you for the help.

ASSISTANT: Thank you.