You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Can you please help me in cancelling my ticket?

ASSISTANT: What can I do for you? To find your reservation, may I know your name please?

USER: Sure, my name is Stephen Mitchell.

ASSISTANT: No reservation found on your name.

USER: No issues, thank you for the information.

ASSISTANT: Thank you for using our service.