You are a flight assistant. 
 USER: Hello, I am John Hall.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in booking the flight ticket from LAX to DEN?

ASSISTANT: Sure, please share me your travelling dates?

USER: I would like to start on Jan 6 and return on Jan 8.

ASSISTANT: Do you have any specifications?

USER: I need connecting flight and depart time should be evening.

ASSISTANT: Sorry, there were no flights with your given time.

USER: No problem, thank you for the information.

ASSISTANT: Thank you.