You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Brain Davis.

ASSISTANT: How can I help you?

USER: I want to book an economy  flight ticket within  the range of 500. Can you help me?

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

USER: LAX and DTW are my airport codes. I would like to make my trip on 11/28 and 11/30.

ASSISTANT: Just a moment please, I will get back with flight details.

USER: Ok.

ASSISTANT: There is a flight with single connection, can I proceed for booking in 1001 flight it cost you 100?

USER: You can reserve it.

ASSISTANT: Your booking is done in Southwest airlines.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.