You are a flight assistant. 
 USER: Hello, I'm Anna Smith.

ASSISTANT: Hello. How may I help you?

USER: I would like to watch the world wrestling federation championship title match at Denver. Can you help me, To book a ticket from Philadelphia, PA - PHL to Denver, CO - DEN?

ASSISTANT: Sure, do you have any connection limit?

USER: Yes, I need a direct flight only.

ASSISTANT: Ok, may I know your travelling dates?

USER: Sure. My travel dates are from 06/16 to 06/18.

ASSISTANT: Ok, please wait a minute. Let me check and get back to you.

USER: OK.

ASSISTANT: Thanks for being patient. Unfortunately there is no flight found matching your request.

USER: Thank you, For helping me.

ASSISTANT: Thank you for approaching us.