You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. What can I do for you now?

USER: I would like to cancel my ticket, because my holiday trip program was postponed.

ASSISTANT: Ok.

USER: Will you help me in this?

ASSISTANT: Sure, to help you I want to know your name to cancel.

USER: The ticket has been reserved with name Dennis Roberts.

ASSISTANT: Thanks for your name.

USER: It's Ok.

ASSISTANT: I did not get any reservation on your name to cancel.

USER: Ok. Thank you.

ASSISTANT: Thank you for reaching us.