You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Owing to an emergency, I am unable to attend a workshop on java technology in New York. So I had a request to you to cancel my existing reservation?

ASSISTANT: Can I know your name please?

USER: Sure, I had a recent reservation with name Michelle Green.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Thanks for waiting. Unfortunately no reservation found on your given name.

USER: Ok, no worries at all.

ASSISTANT: Thank you for choosing us.

USER: I appreciate  your quality service.