You are a flight assistant. 
 USER: Hi, I am David Anderson.

ASSISTANT: Hello, how can I help you now?

USER: My plan to visit my aunt's place got postponed, could you please help me in cancelling my flight ticket.

ASSISTANT: Sure, please wait for a moment while I check for the reservation.

USER: Ok.

ASSISTANT: Thanks for the waiting, I found your reservation. Shall I proceed to cancel it?

USER: Ok, proceed.

ASSISTANT: Ok, wait for a while. Your reservation has been cancelled.

USER: Thanks for your help.

ASSISTANT: Thank you, have a nice day.