You are a flight assistant. 
 USER: Hi, I am Rachel King.

ASSISTANT: Hello, how can I assist you today?

USER: I need to book a flight in afternoon time on Apr 6th to reach DFW, so please help me in booking.

ASSISTANT: Sure, I am here to help you. May I know your return date please?

USER: Sure, my return date is 8th of the same month.

ASSISTANT: Ok, may I know your source airport code please?

USER: My source airport code is ORD.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you.

USER: Sure.

ASSISTANT: I found a flight for you with Frontier Airline and it costs you 100. Shall I proceed to reserve a seat in this single connecting flight?

USER: Ok, please proceed if it is in afternoon time.

ASSISTANT: Your ticket has been booked with 1019 flight number in afternoon time.

USER: Thank you.

ASSISTANT: Welcome, thank you for choosing us. Have a safe flight.