You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I have already reserved my ticket, but right now I want to cancel that reservation. Can you help me with this?

ASSISTANT: Sure, will you provide your name?

USER: I am Helen Allen.

ASSISTANT: Ok Helen, your reservation is cancelled.

USER: Thank you very much for helping me.

ASSISTANT: Welcome, have a great day.