You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you help me to book a flight ticket from MSP to IAD?

ASSISTANT: Please provide me your itinerary travel dates.

USER: Mar, 21 and Mar, 23 are my travel dates.

ASSISTANT: May I know about your connection limit?

USER: I would prefer single connection.

ASSISTANT: Are there any more preferences that you want to avail?

USER: I need to depart at evening time.

ASSISTANT: May I know your name please?

USER: Edward Thomas here.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Edward Thomas. I regret to inform that there are no flights on your route with the given dates.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.