You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Myself Ruth Clark, can you help me to book a flight from DCA to HOU?

ASSISTANT: Sure, can you please share your planned travel dates?

USER: Ok, my departure date and return date are 12/22 and 12/24.

ASSISTANT: May I know your name please?

USER: Yes, I have mentioned above.

ASSISTANT: I found a flight for you in Delta airlines with fare 200 and 1 connection. Shall I book your ticket?

USER: No, don't proceed. I need a direct flight.

ASSISTANT: Sorry, no flights has been found on your request.

USER: That's ok, thank you for assisting me.

ASSISTANT: Thank you for choosing us.