You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am planning to visit Washington, will you help me in booking the flight ticket from MSP to DCA?

ASSISTANT: Sure, I am here to help you. Can you please provide your journey dates?

USER: My travelling dates are Apr 12 and Apr 14.

ASSISTANT: Do you have any class preference for this trip?

USER: I always prefer economy class.

ASSISTANT: May I know your connection limit preference?

USER: I need a connecting flight.

ASSISTANT: Can you please provide your name to proceed further?

USER: Daniel Lopez here.

ASSISTANT: Daniel Lopez, there are no flight services are available on this route on your provided dates.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for contacting us.