You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I provide service to you?

USER: I want you to book a flight ticket for me to travel from DEN to LAS?

ASSISTANT: Sure, could you please share your depart and arrival dates?

USER: I will depart on Feb 24th and will return back on Feb 26th.

ASSISTANT: Do you have any airline preference?

USER: Yes, please select a normal-cost airline for me.

ASSISTANT: Sure, Please let me know your connection limit?

USER: I am fine with maximum one connection.

ASSISTANT: Is there any other preferences?

USER: I would like to depart in the morning time.

ASSISTANT: Ok, may I know your good name?

USER: Sure, my name is Deborah Johnson.

ASSISTANT: Sorry Deborah Johnson, there are no flights found from your source on given dates.

USER: Not a problem, thank you for checking it.

ASSISTANT: Thank you for opting us, hope to serve you again.