You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Catherine Lopez this side, can you help me in flight ticket booking?

ASSISTANT: Sure, may I know your airport codes please?

USER: I am looking to travel from CLT to LAS, I have week-off party at Las Vegas.

ASSISTANT: Ok, may I know your travel dates please?

USER: See for the tickets on 05/16 and 05/18.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight for you.

USER: See the flights with price limit 500.

ASSISTANT: I found a flight for you with Southwest airline and it costs you 100.

USER: Please book it.

ASSISTANT: Your ticket has been booked with 1018 flight number.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us, have a safe flight.

USER: You are welcome.