You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Mary Wright here, I want to book a flight ticket to attend my business meeting in Dallas, could you please help me in booking my flight ticket from CO-DEN to TX-DFW.,.

ASSISTANT: Sure, can you please send your journey dates?

USER: I prefer a connection. I would like to fly out on 04/21 till 04/23.

ASSISTANT: Do you have any price limit?

USER: Yes, it is 200.

ASSISTANT: Please wait for a while. I will check the availability of flights.

USER: Ok.

ASSISTANT: Sorry, I did not found any flights with your given details.

USER: Ok, no issues I will try other source.

ASSISTANT: Thanks for reaching us.

USER: Thanks for your great service.

ASSISTANT: Thank you.