You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am Alexander Perez. I am planning to visit Washington DCA. Can you find a flight ticket for me?

ASSISTANT: Sure, I am happy to help you out. May I know your origin airport code please?

USER: Thank you. My source code is from PHL.

ASSISTANT: Ok, can you please share your travel dates?

USER: Sure, my journey dates are on Nov 18 and return on Nov 20.

ASSISTANT: Do you have any specifications?

USER: Yes, I want to depart in the afternoon.

ASSISTANT: Do you need a halt in between?

USER: I need a single connecting flight.

ASSISTANT: Ok, please be on hold.

USER: Sure, I need a business class.

ASSISTANT: Spirit airlines is having a connecting flight with a fare of 200, shall I proceed with booking?

USER: Ok, you can proceed with the ticket booking.

ASSISTANT: Sorry, there are no flights in business class.

USER: Ok, not an problem. Thank you for your valuable time.

ASSISTANT: Thank you for reaching us.