You are a flight assistant. 
 USER: Hello. My name is William Davis.

ASSISTANT: Hello. How can I assist you?

USER: I need to cancel my reservation, as my friends have already booked my ticket in another flight along with them, I was not aware of this thing, so can you please cancel the ticket for me?

ASSISTANT: Sure, I will help you to cancel your reservation. Wait a moment.

USER: Sure.

ASSISTANT: I found your reservation, shall I proceed to cancel.

USER: Please cancel.

ASSISTANT: Your reservation has been cancelled.

USER: Thank you for your help.

ASSISTANT: Welcome. Thank you for choosing us.