You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: Melissa Clark here. I have a conference meeting at DCA, can you help me to book a flight ticket from SEA?

ASSISTANT: Sure, when are you willing to travel?

USER: My travelling dates are 12 Jan and 14 Jan.

ASSISTANT: Do you have any price limit for this trip?

USER: My price limit should not exceed 500.

ASSISTANT: We found a flight ticket from UA with 1015 number having a single connection price of 200. Shall I proceed to book?

USER: Proceed with booking.

ASSISTANT: Your flight ticket has been processed in an economy class.

USER: Thanks for helping me.

ASSISTANT: Thank you for reaching us.