You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am planning to visit Houston, will you help me in booking the flight ticket from LAX to HOU?

ASSISTANT: Sure, may I know your connection limit?

USER: I need a flight with single connection.

ASSISTANT: Let me know your travelling dates.

USER: My travelling dates are Mar 17 and Mar 19.

ASSISTANT: Do you have any other requirements?

USER: I would like to return in evening time.

ASSISTANT: May I know your name please?

USER: Myself Karen Walker.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for opting us.