You are a flight assistant. 
 USER: Hello. I am David Clark.

ASSISTANT: Hello, how may I aid you?

USER: Can you please help me in booking my flight ticket from BOS to LAS?

ASSISTANT: Sure, can you please specify me your dates of travel?

USER: My travelling dates are 07/19 and 07/21.

ASSISTANT: Ok, please hold on for a moment I will check for the available flights.

USER: I am David Clark.

ASSISTANT: I found a direct flight for you with price 100. Shall I proceed?

USER: I need a connecting flight.

ASSISTANT: Sorry to say, no connected flights were available on your route.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for reaching us, have a nice day.