You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am David Thompson.

ASSISTANT: How may I assist you?

USER: I want to cancel my recent reservation as I am not issued with leave. Please help me with cancellation.

ASSISTANT: Sure, please wait a moment.

USER: OK.

ASSISTANT: We found a reservation on your name. Shall I cancel your reservation?

USER: Please go with cancellation.

ASSISTANT: Your reservation has been cancelled.

USER: Thanks for your help.

ASSISTANT: Thank you so much.