You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: As I am a scientist, I want to attend science festival with my students at Washington. Can you do the reservation?

ASSISTANT: OK. I will help you in this. Can you please share your airport codes?

USER: My airport codes are PHL-IAD.

ASSISTANT: When would you like to travel?

USER: My journey dates are 12/30 and 01/01.

ASSISTANT: Do you have any airline preferences?

USER: I am comfortable with normal cost flight.

ASSISTANT: May I know your name please?

USER: Benjamin Green here.

ASSISTANT: We have an economy class, connecting flight operated by Delta Airlines with a fare of 100. Is it ok for you? Shall I reserve it?

USER: Go ahead.

ASSISTANT: Your flight ticket has been booked with 1001 number.

USER: Thank you so much.

ASSISTANT: Thank you for reaching us.