You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I want to participate in Death Valley Adventure at Boston, BOS. Can you please book a ticket from LAS?

ASSISTANT: Sure, can I know your good name please?

USER: I am Mark Harris.

ASSISTANT:  When you are willing to travel?

USER: My travelling dates are Sept 1 and Sept 3.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I want single connection.

ASSISTANT:  Would you let us know if you have any other preferences?

USER: I don't have any other preferences.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for opting us.