You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: I am looking for a flight from DEN to LAX, can you help me in booking?

ASSISTANT: Sure, please share me your good name.

USER: Myself Andrew Lewis.

ASSISTANT: May I know your travel dates?

USER: Sure, my planned travel dates are Aug 19 and Aug 21.

ASSISTANT: May I know your class preferences?

USER: No, I don't have any other specifications.

ASSISTANT: Do you need direct flight or connecting flight?

USER: Please look for a connecting flight.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for opting us.