You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Scott Lewis here.

ASSISTANT: How may I help you?

USER: I am looking for a flight ticket with afternoon as the depart time. So can you book it for me?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: The travel dates for the trip are from 19 Apr to 21 Apr.

ASSISTANT:  Is there any another specifications on your trip, so that I can arrange like that only.

USER: I am looking for a business class.

ASSISTANT: Sure, may I know your respective airports codes please?

USER: The airport codes are from BOS to DEN. Make sure it is a single connecting flight.

ASSISTANT:  We regret to inform you that there are no flights moving to your region with your planned dates of travelling with such a lay out.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thanks for contacting us, have a good day.