You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to take part in a quiz contest at San Francisco. Could you book my ticket from DFW to SFO?

ASSISTANT: Sure, I am here to help you. Could you please share your journey dates to search a flight availability?

USER: My itinerary dates are 08/31 and 09/02.

ASSISTANT: Let me know your name?

USER: My name is Jack Phillips.

ASSISTANT: Sorry, there is no flight is available for you.

USER: That's ok, thank you for helping me.

ASSISTANT: Welcome.