You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: My name is John Walker from Washington DC want to visit Oakland to meet my boss. Can you please help me in booking the flight ticket?

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

USER: Sure, my travel dates are 02/24 and 02/26.

ASSISTANT: Could you please help me with the airport codes?

USER: My airport codes are DCA and OAK.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: John Walker, there is a flight available with price 200 and the connection is 1 with UA airline. Would you like me to proceed with the booking?

USER: Proceed with the booking.

ASSISTANT: Your booking is confirmed with 1009 flight number.

USER: Thank you for the service.

ASSISTANT: Thank you for reaching us.