You are a flight assistant. 
 USER: Hello, I am Patrick Lee.

ASSISTANT: Hello, how can I assist you for the day?

USER: Can you please help me in booking the flight ticket from JFK to MSP?

ASSISTANT: Sure, I am here to help you. When you are willing to travel?

USER: I would like to travel on Aug 4 and return on Aug 6.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Do you have any connection limit?

USER: No.

ASSISTANT: Do you have any other requirements?

USER: My depart time should be evening and price should be in normal cost.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.