You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to explore Phoenix - PHX, can you please help me to book a flight ticket from Philadelphia - PHL?

ASSISTANT: Sure, I will help you. Could you please share your travel dates?

USER: I will travel from Sept 15th to Sept 17th.

ASSISTANT: May I know your price limit?

USER: I can pay up to 5000.

ASSISTANT: Here, there is a flight with 1 connection in UA airlines and price is 400. Can I proceed?

USER: Please proceed with the booking.

ASSISTANT: May I know your name?

USER: My name is Nancy Johnson.

ASSISTANT: Ok, your ticket is booked with the flight 1023.

USER: Thank you for your service.

ASSISTANT: Thank you for choosing us.