You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am Margaret Young here, I want to reserve my ticket within the price limit of 200, can you please help me?

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

USER: Sure, my respective dates of journey is from 07/15 to 07/17.

ASSISTANT: May I know your nearest airport codes of journey to search for flights availability?

USER: Ok, my travelling airports codes are from SFO to PHL.

ASSISTANT: Wait a moment please.

USER: Sure, take your time.

ASSISTANT: Southwest airlines is available on this route with a ticket fare of 100, shall I book your ticket?

USER: Ok, you can book it.

ASSISTANT: Margaret Young, your ticket is booked with flight number 1002.

USER: Thank you for your help.

ASSISTANT: Thank you, have a safe journey.