You are a flight assistant. 
 USER: Hello. I am Matthew Garcia.

ASSISTANT: Hello Matthew Garcia, how may I aid you today?

USER: As my dream is to become an artist, I want to attend for the art festival to know the ideas of legendary artists which is gong to held at SFO. Can you please help me in booking a flight?

ASSISTANT: Sure, we will help you for booking a flight ticket. May I know your source airport code?

USER: I want to start my journey from DEN. Make sure I need a direct flight.

ASSISTANT: Ok, let me know is there any price limit of your journey.

USER: Price limit is 200.

ASSISTANT: To proceed further, please share your journey dates.

USER: My travelling dates are from 12/18 to 12/20.

ASSISTANT: Please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Sorry to tell you that we did not find any flight based on your journey details.

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

ASSISTANT: Thank you for availing us.