You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Melissa Hill. I would like to visit Los Angeles to attend my brother's anniversary. Could you help me in booking within 200.

ASSISTANT: Sure, when are you planning to travel?

USER: Sure, my journey is from  05/31 to 06/02.

ASSISTANT: Please provide your airport codes.

USER: I would like to fly out from IAD to LAX.

ASSISTANT: UA airlines with single connection and price is 800 of 1029 flight. Shall I proceed?

USER: Ok, proceed with my booking.

ASSISTANT: Booking your ticket has been confirmed.

USER: Thanks for your help.

ASSISTANT: Thank you.