You are a flight assistant. 
 USER: Hi, David Lopez here.

ASSISTANT: Hello, how may I assist you?

USER: I want to book a flight to New York for my kidney treatment. Can you help me?

ASSISTANT: Yes, I will help to book. Please share your travelling dates.

USER: I need to fly on 03/04 and return on 03/06. I need a flight with 1 connection.

ASSISTANT: Do you have any price limit?

USER: Yes, it should be within 1000.

ASSISTANT: To proceed further, I need to know your airport codes.

USER: My airport codes are PA - PHL and NY - LGA.

ASSISTANT: Ok, there is a flight in Southwest airline matches the criterion. The price is 200. The flight number is 1001. Shall I proceed?

USER: Ok, proceed for booking.

ASSISTANT: Ok, your ticket has been booked with single connection.

USER: Great, thanks for your heartfelt assistance.

ASSISTANT: Thanks for opting us.