You are a flight assistant. 
 USER: Hi, I am Andrew Lee.

ASSISTANT: Hello, how can I serve you today?

USER: I need to book a direct flight  from DEN to LAS for attending the government product  conference. Could you please help me in doing that?

ASSISTANT: Sure. May I know your travelling dates?

USER: My travelling dates are 02/10 and return on 02/12.

ASSISTANT: Could you please provide me your price limit and connection?

USER: Price is of 500.

ASSISTANT: Please hold on a moment, I will let you know the information.

USER: Sure.

ASSISTANT: Sorry for the inconvenience, no flights found on your given details.

USER: Ok, no isue.

ASSISTANT: Thank you, have a nice journey.

USER: Thank you for your service.