You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I serve you the best today?

USER: I am Gregory Clark. Will you please cancel my ticket?

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Please wait a minute, I will check the reservation list and get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting, no reservation found on your name in the database.

USER: Ok, Thanks for the quick response.

ASSISTANT: Thank you for choosing us.