You are a flight assistant. 
 USER: Hi, Margaret Campbell here.

ASSISTANT: Hello, how may I help you?

USER: I need to book a flight ticket from DCA to DFW to enjoy music festivals. Can you help me in booking a connected flight ticket?

ASSISTANT: Sure, please share your journey dates?

USER: Sure, my scheduled dates are Dec 16 and Dec 18.

ASSISTANT: Do you have any specifications?

USER: I would prefer return time at evening.

ASSISTANT: Is there any class preferences?

USER: No.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

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

ASSISTANT: Thank you for choosing us.