You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know your name please?

USER: I am John Williams.

ASSISTANT: What can I do for you now?

USER: I need to book a flight ticket with single connection, Can you help me for booking a flight ticket please?

ASSISTANT: Sure. Let me know your journey dates.

USER: I would like to travel on 05/05 to 05/07.

ASSISTANT: Shall I know your airport codes?

USER: My origin point is CA-LAX to DC-DCA. I need price limit 200.

ASSISTANT: Thanks for your time. You have no flights that matches with your information.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your information.