You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you help me in booking my flight ticket from DCA to HOU?

ASSISTANT: Sure, I am here to help you out. May I know your travel dates please?

USER: My trip dates will be June 19th to June 21st.

ASSISTANT: Can you please share your connection limit?

USER: I prefer a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: May I know your name please?

USER: I am Laura Lewis.

ASSISTANT: Laura Lewis, there are no flights available in your route with you preference.

USER: Its ok, thank you.

ASSISTANT: Thank you for choosing us.