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: Yes, can you share me your name?

USER: Thank you for your response, my name is Donald Thompson.

ASSISTANT: I have cancelled your reservation successfully.

USER: Thank you for your service.

ASSISTANT: Thank you for contacting us.