You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Kevin Johnson.

ASSISTANT: Kevin, how can I assist you?

USER: Can you please help me in booking a flight ticket from DEN to EWR locations?

ASSISTANT: Sure, may I know your trip dates?

USER: My travelling dates are from 07/02 and 07/04.

ASSISTANT: Please hold on for a moment.

USER: Ok.

ASSISTANT: Sorry, no flight is available on your route.

USER: It's ok. Thank you for the information.

ASSISTANT: Thank you for choosing us.