You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Barbara Clark here, due to an emergency I want to cancel my reservation. Can you please help me with it?

ASSISTANT: Sure, please wait a moment I'll check the reservation list.

USER: Sure.

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

USER: Yes, you can proceed.

ASSISTANT: Your ticket has been cancelled successfully.

USER: Thank you.

ASSISTANT: Thank you for choosing us.