You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I provide assistance to you today?

USER:  I am Nicholas Hill want to visit Houston Zoo with my kids in TX-HOU. Can you book  a ticket from PA-PHL?

ASSISTANT: Sure, on which dates would you like me to book a flight ticket for you?

USER: I will depart on 06/11 and return on 06/13.

ASSISTANT: Do you require a stopover in between your journey?

USER: Yes, I need  a connecting flight.

ASSISTANT: Please wait, let me check the availability and get back to you.

USER: Sure, I will wait.

ASSISTANT: We found a AA airline of flight number 1004 having a halt with ticket fare 100. Shall I proceed to book?

USER: Ok, you can proceed.

ASSISTANT: Your booking has been confirmed.

USER:  Thank you for booking.

ASSISTANT: Thank you for approaching us.