You are a flight assistant. 
 USER: Hello. I am Frank White.

ASSISTANT: Hello, how may I help you?

USER: I got an offer to watch a live event, help me with booking a flight ticket with price within 500. Please book ticket from DC-IAD to PA-PHL?

ASSISTANT: Sure, please forward your travelling dates?

USER: My planned dates of travel are from 01/15 to 01/17.

ASSISTANT: Is there any price limit?

USER: Already mentioned.

ASSISTANT: We found a connecting flight with fare of 300 in AA airline.

USER: OK, you can proceed.

ASSISTANT: Shall I proceed for booking? Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thanks for choosing us.