You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I want to book a flight ticket from Dallas to meet my former colleague in Minneapolis, can you please help me to book a flight ticket with single connection?

ASSISTANT: Sure, may I know your genesis and terminus airport codes?

USER: My boarding and landing airport codes are DFW and MSP.

ASSISTANT: Please provide your itinerary dates.

USER: I need to depart on Dec 21st and my return date will be on Dec 23rd.

ASSISTANT: Which class do you prefer?

USER: I need an economy class ticket.

ASSISTANT: Do you have any other specifications?

USER: I want to return in the afternoon.

ASSISTANT: Please give me a moment to check for available flights.

USER: Sure.

ASSISTANT: May I know your name?

USER: I am David Scott.

ASSISTANT: Sorry David Scott, no flights are available on your route.

USER: No issues, I'll choose any other alternative. Thank you.

ASSISTANT: Thank you for choosing us.