You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: This is Donna Campbell. Could you please book a flight ticket for me from DC-IAD to TX-IAH?

ASSISTANT: OK, could you please tell me travelling dates?

USER: My departure day is 07/28 and return day is 07/30. I want 0 connection and price limit is 200.

ASSISTANT: OK. Give me a moment.

USER: Sure.

ASSISTANT: I had found a flight matching your requirement. The flight number is 1012 of delta airlines.

USER: Thank you for your immediate response. Please book this flight ticket.

ASSISTANT: The price is 100, but with a connection of 1.

USER: Sorry, I need only 0 connection don't book this ticket.

ASSISTANT: OK. Thank you for reaching us.

USER: Thank you.

ASSISTANT: Have a good day.