You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you now?

USER: I want to attend a Seminar in San Francisco. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I am here to help you. May I know your origin airport code, please?

USER: My airport codes are DEN and SFO.

ASSISTANT: Let me know your travel dates, please.

USER: My travelling dates are July 22 and July 24.

ASSISTANT: Do you have any connection limit?

USER: I need direct flight.

ASSISTANT: Do you have any class preference?

USER: No, but I want to travel in normal cost airline.

ASSISTANT: Ok, provide me your name to proceed further.

USER: My name is Angela Collins. I want to departure in Morning.

ASSISTANT: Ok. Sorry, no flights are found on your routes.

USER: Anyway, thanks for the information.

ASSISTANT: Thanks for opting us.