You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I support you today?

USER: Owing an emergency, I want to cancel my reservation. Can you help me for that?

ASSISTANT: Sure, may I know your name please?

USER: My name is Brian Evans.

ASSISTANT: Please wait a moment I'll check the reservation list.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you waiting, we found a reservation by this name. Shall I cancel the ticket?

USER: Ok, please cancel my reservation.

ASSISTANT: Your ticket has been cancelled successfully.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.