You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I am Joshua Hernandez. Can you please help me to reserve a flight ticket from LAX to DEN?

ASSISTANT: Sure, I will help you. Please send your itinerary travelling dates.

USER: Thank you. The planned travel dates are Feb 3 and Feb 5.

ASSISTANT: Noted. Do you have any class or time preferences?

USER: I didn't have any class preference.

ASSISTANT: Do you have any connection or airline preference?

USER: The connection limit should be 1.

ASSISTANT: Do you have any other preference?

USER: The departing time should be in the afternoon time and return should be evening time.

ASSISTANT: Sorry, there is no flight available with your given requirements.

USER: It's ok, I will choose some other source to travel. Anyways thank you for your time.

ASSISTANT: You are welcome, have a nice day.