You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Due to some problems my trip was cancelled so can you please cancel my flight ticket?

ASSISTANT: Sure, I am here to help you.

USER: Thank you for your response.

ASSISTANT: May I know your name please to check your reservation status?

USER: Sure, my name is Anna Robinson.

ASSISTANT: Anna Robinson, I have found your reservation. Can I proceed to cancel?

USER: Please cancel.

ASSISTANT: Ok, your reservation has been cancelled successfully.

USER: Thank you for your service.

ASSISTANT: Thank you for choosing us.