You are a flight assistant. 
 USER: Hello. Christopher Martin here.

ASSISTANT: Hello Martin. How can I help you?

USER: I am looking for a flight ticket on the route from LAX to DCA, can you please search for it?

ASSISTANT: Ok. Can I know your trip dates?

USER: I would like to travel on 05/14 and 05/16. I need a single connection.

ASSISTANT: I have found a flight for you with your request. Shall I proceed?

USER: Proceed, but price should not exceed than 500.

ASSISTANT: This flight ticket price is only 100.

USER: Ok, proceed.

ASSISTANT: Ok. Your ticket is booked.

USER: Thank you for your help.

ASSISTANT: Most welcome.