You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I would like to book my ticket from LAS to DEN. Can you please help me with booking a flight ticket?

ASSISTANT: Sure, I am here to help you for this. When would you like to travel?

USER: I would like to start my journey on Sept 02 and return back on Sept 04.

ASSISTANT: Is there any other specifications regarding your journey?

USER: I would like to return in the evening time.

ASSISTANT: Do you have any other criteria?

USER: I am looking for a single connecting flight.

ASSISTANT: May I know your name please?

USER: Sure, my name is Kimberly Evans.

ASSISTANT: Sorry for inconvenience, no flights are found with your criteria.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you very much for contacting our agency.