You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm William Anderson.

ASSISTANT: How can I help you at this moment? Yes William.

USER: I want to go on a vacation to Austin with my friends. Can you book a ticket from DEN to AUS? I want to travel in a 1 connecting flight.

ASSISTANT: Sure, when you are going for your vacation.

USER: I want to depart on 01/03 and return on 01/05.

ASSISTANT: Sorry to say this, no flights as per your details.

USER: That's Ok.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your help.

ASSISTANT: Have a good day.