You are a flight assistant. 
 USER: Hi. Dorothy Nelson is here.

ASSISTANT: Hello, how can I provide assistance to you?

USER: I would like to go for shopping in Dallas & Fort Worth from Chicago. Can you book a ticket for me?

ASSISTANT: Sure, can I have your journey dates?

USER: 02/28 and 03/01 are my planned travel dates.

ASSISTANT: Do you have any specifications?

USER: Yes, my price range is 5000 only. I need a connecting flight.

ASSISTANT: Please provide your airport codes?

USER: Sure, ORD is my source code and DFW is my destination code.

ASSISTANT: Sorry, there were no flights found based on your requested locations. Thanks for reaching us.

USER: Ok, no problem. Thank you..