You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Deborah Collins. I have recently visited for Museum of Science and Industry in Chicago, so I want to book a return ticket to Dallas & Fort Worth. My origin airport code is ORD and destination airport code is DFW.

ASSISTANT: Please provide your journey dates.

USER: My arrival date and departure date are 07/23 and 07/21.

ASSISTANT: Please provide your connection.

USER: I need a direct flight.

ASSISTANT: Sorry, there is no flight available. Thanks for reaching us.

USER: Ok, not an issue. Thank you.