You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any help from us?

USER: Can you help me to book a flight in the month of December on 15 and 17?

ASSISTANT: Sure, could you please share your location airport codes?

USER: My airport codes are MSP and DEN.

ASSISTANT: Ok, could I have your name please?

USER: Sure, James Phillips here.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: I need a connecting flight.

ASSISTANT: Ok, may I know your airline preference?

USER: I am comfortable with any airline.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I will wait, but I need to return in the evening time.

ASSISTANT: The economy class with flight number 1003 of Southwest airline is available having fare as 100 and connection as 1, is it ok for you?

USER: If the return time is afternoon, then you can proceed.

ASSISTANT: Sorry, there is no flight with your requested time.

USER: Ok, thanks for the help.

ASSISTANT: You are welcome, have a great day.