You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Can you help me in booking a flight ticket from DCA to LAS?

ASSISTANT: Sure, when are you planning to travel?

USER: I want to travel on 01/01, and return on 01/03.

ASSISTANT: How many connections do you need?

USER: I am comfortable with any flight.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: May I know your name?

USER: I am Dennis Roberts.

ASSISTANT: Dennis Roberts, we regret to inform you that there are no flights going on your way at this moment.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for choosing us.