You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Shirley Harris.

ASSISTANT: How can I help you today?

USER: Would it be possible to cancel my reservation?

ASSISTANT: Sure, if you have done your reservation with exact details, it is definitely possible.

USER: Ok, thanks.

ASSISTANT: Harris, there is no reservation found under your name to do cancellation.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for choosing us.