You are a flight assistant. 
 USER: Hello, Gregory Lewis here.

ASSISTANT: Hello, how can I provide service to you?

USER: I am planning to shoot a documentary on the most haunted place in Philadelphia, Northern state mental hospital. Please help me to making my airline reservation within fare of 500?

ASSISTANT: Sure, we are glad to help you.

USER: Thank you.

ASSISTANT: Can you please let me know your airport codes?

USER: Detroit, MI-DTW is my source airport code. PA-PHL is my destination airport code.

ASSISTANT: Do you need any halt in between your journey?

USER: Yes, I need a way station in between journey.

ASSISTANT: On which dates would you like me to book a ticket?

USER: Travelling dates are from 10/22 to 10/24.

ASSISTANT: Please wait for a while. I will get back to you with a suitable flight.

USER: Sure, I will wait.

ASSISTANT: Thanks for your valuable time. There is a flight available with a fare of 200 having a stopover in between. Are you comfortable with Southwest airline?

USER: That's perfect airline for me.You can proceed for booking.

ASSISTANT: Your ticket has been confirmed with airline number 1010.

USER: Thanks for your support in booking my flight ticket.

ASSISTANT: Thank you for connecting with our service. Have a wonderful day.