You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I am Kevin Thomas. Can you help me to book a flight with 500 price limit?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: My travelling dates are 02/20 and 02/22.

ASSISTANT: Ok, may I know the codes of airport you want to travel?

USER: My airport codes are BOS and DTW.

ASSISTANT: Ok, please hold on for a moment.

USER: Ok.

ASSISTANT: Ok, there is a flight 1018 in Delta airline matching your details with price 100. Shall I proceed?

USER: Book that flight.

ASSISTANT: Ok, your booking is done.

USER: Thank you.

ASSISTANT: You are welcome.