You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Please help me to book a business class ticket from Washington to meet my old friend to start a new business in San Francisco.

ASSISTANT: Sure, may I know your name please?

USER: I am Donna Lee.

ASSISTANT: Help me with the trip dates?

USER: I intend to start on Sept 6th and my return date will be on Sept 8th.

ASSISTANT: Can I have your airport codes please?

USER: I would like to fly from IAD and my destination airport code is SFO.

ASSISTANT: Do you have any specifications?

USER:  I prefer to take a break, because one of my friend will meet me in between my journey.

ASSISTANT:  Ok Donna Lee, We have a United airline that leave from IAD and arrive at SFO with 1 stopover in the middle and the estimate is 200. Is that fine for you?

USER: That's fine, you can proceed with the booking.

ASSISTANT: Your request for booking has been processed with 1027 number flight and your e-ticket will be sent to your registered email address within 2 to 3 working hours.

USER: Thank you for your support in booking.

ASSISTANT: Thank you for reaching us. Have a safe flight.