You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: William Roberts here.

ASSISTANT: How can I assist you?

USER: I am planning to visit Detroit historical museum. Please book a ticket from DEN to DTW.

ASSISTANT: May I know your travelling dates?

USER: My travel dates are 09/13 and 09/15.

ASSISTANT: I found a flight with your requirements in 1001 flight number.

USER: Please book my ticket.

ASSISTANT: Your ticket is booked.

USER: Thank you for assisting me.

ASSISTANT: Thank you for approaching us.