You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Christine Evans.

ASSISTANT: How may I serve you at this moment?

USER: I would like to buy a plane ticket with in price 500. Can you help me in finding?

ASSISTANT: Sure, when would you like me to book a flight ticket?

USER: I need to reach my destination by 09/22 as I have a conference next day.

ASSISTANT: Ok, can you please provide your corresponding airport codes?

USER: My origin is Los Angeles, CA - LAX and final destination is Philadelphia, PA - PHL.

ASSISTANT: Ok, can I have your return date please?

USER: I would like to return on 09/24.

ASSISTANT: We found a Jet Blue airline with fare of 200 and a halt in between the journey matches your schedule.

USER: Ok, please proceed.

ASSISTANT: Your ticket has been confirmed with flight number 1020.

USER: Thanks for your service.

ASSISTANT: Thank you for reaching us.