You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Please book me a flight ticket from DFW to MSP to meet my family.

ASSISTANT: Sure, I can help you with that. May I know your travel dates please?

USER: I have planned to travel on Aug 03rd and return on Aug 05th.

ASSISTANT: Do you need break in between your journey?

USER: I prefer connecting flight.

ASSISTANT: Can I have your good name please?

USER: Sandra Williams.

ASSISTANT: Please let me know if you have any other specifications.

USER: I want to return at evening time.

ASSISTANT: Sandra Williams, there are no flights available for you on those dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.