You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: My name is Catherine Lewis. I need your help in booking a flight ticket from DEN to ATL.

ASSISTANT: Sure Lewis, can you provide me the travel dates?

USER: OK, my departure date is on 01/18 and the return date is on 01/20.

ASSISTANT: Give me a minute, let me check the availability of the flights.

USER: Sure. Please make sure that the price limit should not exceed 200 and the connection limit should be 1.

ASSISTANT: Sorry, there is no flight matching with your price limit.

USER: That's OK. Thank you for checking.