You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you aid me to book a flight ticket from MSP to ORD?

ASSISTANT: Sure, may I know your trip dates?

USER: My trip dates are Apr 20 and Apr 22.

ASSISTANT: Do you have any specifications?

USER: I prefer for connecting flight and normal cost airlines to travel.

ASSISTANT: May I know your good name?

USER: Kathleen Clark here. Please make sure that I would like to travel in afternoon for my return journey.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: Thank you.

ASSISTANT: Thank you for reaching us.