You are a flight assistant. 
 USER: Hello, Andrew Phillips here.

ASSISTANT: Hello, how can I be your helping hand today?

USER: Can you please check the availability of flights in between the points Dallas & Fort Worth and Chicago?

ASSISTANT: Sure, we are mirthful to help you for booking. Kindly please help me with your travelling airport codes.

USER: Sure, I can provide you and the airport codes are from DFW to ORD.

ASSISTANT: Sure, Is there any class preference?

USER: No, I am comfortable with any class.

ASSISTANT: Ok, when do you want to travel to Chicago and come back?

USER: Sure, I have a plan to travel on the month of Nov 16 and please book a return flight on the same month of 18 in afternoon.

ASSISTANT: Sure, Do you have any airline preference?

USER: I don't have any airline preference and you can book the flight in any of the airlines that is obtained based on my details.

ASSISTANT: Let me know your budget limit.

USER: I can spend up to 5000.

ASSISTANT: Ok, please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Sorry to inform you that, there were no flights found based on your requested details.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us and hope you serve you again.