You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

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

ASSISTANT: Sure, I am here to help you. When are you planning to make your journey?

USER: My trip dates are 01/18 and 01/20.

ASSISTANT: Do you have any break in between journey?

USER: I need a connecting flight.

ASSISTANT: May I know your class preference?

USER: I am comfortable with economy class.

ASSISTANT: Is there any other specifications for you?

USER: No.

ASSISTANT: On which name would you like me to book the flight?

USER: Nicole Lee here.

ASSISTANT: Thanks for providing details, we are regret to inform you that no flights are available on your journey dates.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you for opting us.