You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to visit the Dallas Zoo at Dallas, could you please help me in booking a flight ticket from Washington?

ASSISTANT: Sure, may I know your travelling airport codes?

USER: My airport codes are DC - DCA, TX - DFW.

ASSISTANT: Please provide your departure and return date?

USER: I want to fly on 10/25 and return on 10/27.

ASSISTANT: Do you prefer any halt with in your journey?

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

ASSISTANT: May I know your good name?

USER: I am Helen Evans.

ASSISTANT: We found a flight 1010 in Delta airline the price is 100 with one halt. Shall I go ahead with booking?

USER: You can proceed to booking.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you for your help.

ASSISTANT: Thank you for making us to assist you.