You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Andrew Lee.

ASSISTANT: How may I assist you today?

USER: I would like to book a ticket from JFK to DCA, can you please help me out?

ASSISTANT: Sure, I will try to help you but I need your travel dates to search a flight.

USER: I am travelling on these dates 02/10 and 02/12.

ASSISTANT: Please wait for a minute. I found a flight with price 600 and connection is 1, shall I proceed?

USER: My price limit is 500.

ASSISTANT: Sorry, I could not find any flight with your price.

USER: Ok no problem, thank you for your services.

ASSISTANT: My pleasure.