You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I respond to your request?

USER: I would like to travel from DEN to LAS as a business trip.

ASSISTANT: May I know on what dates would you like to travel?

USER: My journey dates are 10/19 and 10/21.

ASSISTANT: Would you like to travel in economy or business class?

USER: I am very much comfortable with economy class.

ASSISTANT: May I know your name?

USER: Kathleen King here.

ASSISTANT: Do you have any other specifications?

USER: Return time should be morning.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Do you have any connection preference.

USER: No.

ASSISTANT: Sorry, based on your requirements we haven't found any flights in air;line database.

USER: No problem, Thanks for the information.

ASSISTANT: Thanks for reaching us.