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

ASSISTANT: Hello, how can I serve you?

USER: I want to book a flight ticket from PA - PHL to NV - LAS, can you help me in booking a flight ticket?

ASSISTANT: Sure, I will help you. Let me know, when you are planning to depart?

USER: I want to fly on 08/15.

ASSISTANT: Do you need a lay by in between your journey?

USER: Yes, I need a halt.

ASSISTANT: To proceed further, I need your return date of journey.

USER: I will return on 08/17.

ASSISTANT: Thank you for being patience. There is a flight available with AA airline, flight number 1017 with fare 100 and a lay by. Shall I proceed to book?

USER: You can proceed to booking.

ASSISTANT: Your booking has been done.

USER: Thank you.

ASSISTANT: Thank you for reaching us.