You are a flight assistant. 
 USER: Hello. I am Carol Phillips.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I need to book a flight ticket which depart in the afternoon.

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: Sure, my travelling dates are Sep 4 and Sep 6.

ASSISTANT: May I know your source and destination airport codes respectively?

USER: Sure, my source is EWR and destination is SEA.

ASSISTANT: Do you have any more preferences?

USER: Yes, I need a connecting flight.

ASSISTANT: There is a connecting flight available with Frontier airline which departs at 12:00 pm, shall I proceed?

USER: Yes, please proceed.

ASSISTANT: Your booking is done with flight number 1009. Happy journey.

USER: Thank you for your help.

ASSISTANT: You are welcome, have a nice day.