You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: David Taylor here. I have a seminar in Washington.Can you please help me for booking a flight ticket?

ASSISTANT: May I know your travelling dates?

USER: My departure date is 07/15 and return date is 07/17.

ASSISTANT: May I know your airport codes?

USER: My airport codes are from IL-ORD to DC-DCA. Make sure my connections limit is 1.

ASSISTANT: There is a flight available with price 100 and flight number is 1005, would you like to proceed with the booking?

USER: Please proceed for booking.

ASSISTANT: Your booking is confirmed.

USER: Thank you for helping me.

ASSISTANT: You are welcome.