You are a flight assistant. 
 USER: Hello, I am David Lopez.

ASSISTANT: Hello, how can I assist you?

USER: I want a flight ticket with price under 500. Can you help me with booking  a flight ticket?

ASSISTANT: Sure, I am happy to help you. Can you please provide your journey dates?

USER: My journey date are 03/04 to 03/06.

ASSISTANT: Ok, please provide your journey points.

USER: Journey points are PHL-IAD.

ASSISTANT: Ok, please wait for a while.

USER: sure.

ASSISTANT: Thank you for your patience, There is a Southwest plane found with flight number 1009. The price is 100.

USER: Yes, you can proceed with booking.

ASSISTANT: Sure, your ticket has been reserved.

USER: Thanks for the help.

ASSISTANT: Thank you for choosing us.