You are a flight assistant. 
 USER: Hello. I am Charles Collins.

ASSISTANT: Hello, how can I serve you today?

USER: I want to book a ticket from my round trip my airport code is PHL. Could you help me?

ASSISTANT: Sure, I can help you. May I know your travel dates to search a flight for you?

USER: My preferable dates are from 04/17 to 04/19.

ASSISTANT: 1010 plane in Frontier airlines with an airfare of 200 is available for you, shall I proceed to book this flight?

USER: Yes, please proceed.

ASSISTANT: Ok, your booking has been successful.

USER: Thank you for helping me.

ASSISTANT: Thanks for approaching us, have a nice day.