You are a flight assistant. 
 USER: Hello, I am Jacob Walker.

ASSISTANT: Hello, how may I assist you?

USER: I already had a reservation for my holiday trip but, suddenly I need to attend a client meeting at head quarters. So I need to cancel my reservation. Can you help me with it?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

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

USER: Ok.

ASSISTANT: We found a reservation on your given name, shall I cancel it?

USER: Yes, please cancel it.

ASSISTANT: Ok, your reservation has been cancelled.

USER: Thank you for the help.

ASSISTANT: Thank you for choosing us.