You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mark Roberts.

ASSISTANT: How can I support you?

USER: I am planning to attend a conference meeting on before Christmas day at HOU from DCA. So can you please help me to book a flight ticket?

ASSISTANT: Sure, can you please share your journey dates?

USER: My journey dates are from 12/21 to 12/23.

ASSISTANT: Do you need any halt in between?

USER: Yes, I need a halt in between journey.

ASSISTANT: Please wait a moment. I will revert to you.

USER: Sure.

ASSISTANT: Thanks for waiting. We found a flight with a fare of 300 having a halt with AA airline. Shall I proceed with booking?

USER: No, don't proceed for booking, my price limit is 200.

ASSISTANT: Ok. Thank you for contacting us.

USER: Thank you.