You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Is this flight ticket booking agency?

ASSISTANT: Yes, you are at right place. How may I aid you?

USER: I want to book a ticket from IAD to DEN, there is a Entrepreneurship Summit at Denver, can you please help me for reservation?

ASSISTANT: Sure, could you please help me with your travel dates to book your flight?

USER: I want to departure from IAD on 10/04 and return date is 10/06.

ASSISTANT: Ok, on whose name I have to book this flight ticket?

USER: Please book this flight ticket on my name Justin Taylor.

ASSISTANT: Ok Justin, please hold on for a moment.

USER: Ok.

ASSISTANT: Sorry Justin, there are no flights found with your requested dates of travelling.

USER: It's ok, no problem, I will go with another airline. Thank you for your information.

ASSISTANT: Welcome, have a great day.