You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you at this moment?

USER: Helen Turner here. I want to cancel my ticket. Can you help me in this?

ASSISTANT: Sure, I will help you with that.

USER: Thanks.

ASSISTANT:  Please hold on a moment, I will check your reservation status.

USER: Sure.

ASSISTANT: There is no previous reservation available in your name Helen Turner.