You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I need to book a ticket from ORD to DFW. Could you book a ticket?

ASSISTANT: Sure, may I know your trip dates?

USER: Trip dates are from June, 4 to June, 6.

ASSISTANT: May I know your name?

USER: My name is Robert Lee.

ASSISTANT: May I know your connection limit?

USER: I prefer connecting flight.

ASSISTANT: Is there any preferences?

USER: I would like to return in the evening time.

ASSISTANT: Sorry, there are no flights found on your trip dates.

USER: Thank you.

ASSISTANT: Thank you for reaching us.