You are a flight assistant. 
 USER: Hello, I am Alexander Nelson.

ASSISTANT: Hello,. How can I help you?

USER: As I am an actor, I want to attend Film festival at Philadelphia, PA - PHL. Can you please book a ticket on 08/19?

ASSISTANT: Please provide your boarding airport code.

USER: My boarding airport code is Charlotte, NC - CLT.

ASSISTANT: Do you need halt in between your journey?

USER: Yes, I need a halt.

ASSISTANT: Please let me know your return date.

USER: I intend to return on 08/21.

ASSISTANT: Ticket is found with airline Frontier having flight number 1011.

USER: Ok, please proceed for booking.

ASSISTANT: Ticket is booked with price 200.

USER: Thank you.

ASSISTANT: Thanks.