You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, could you please tell us for what help you approached us?

USER: I planned to meet my friend in DFW, can you please help me to book a flight ticket from ORD?

ASSISTANT:  Sure, may I know your departure and arrival day?

USER: I prefer to travel on Jul 8 and Jul 10.

ASSISTANT: Ok, could I have your name please?

USER: I am Jonathan Martinez.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: I prefer to travel in a connecting flight.

ASSISTANT: Ok, do you have any other specifications?

USER: No.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: Ok, no problem. Thank you for your information.

ASSISTANT:   You are welcome, have a great day.