You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Frank Martinez.

ASSISTANT: How may I assist you?

USER: I am planning to celebrate my birthday at New York, will you help me in booking the flight ticket from DEN to EWR?

ASSISTANT: Sure, I am glad to help you. May I know on what dates you are willing to travel?

USER: My preferable journey dates are Oct 05 and Oct 07.

ASSISTANT: Do you have any specifications?

USER: I need a flight with single connection which departs in evening time.

ASSISTANT: Sorry, there are no flights found on your trip dates.

USER: Ok, not an issue. Thank you for you information.

ASSISTANT: Thank you for choosing us.