You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Please help me to book a flight ticket from LAS to BOS?

ASSISTANT: Sure, I am happy to help you. May I know your name?

USER: William Martin here.

ASSISTANT: Thank you. Could you please let me know your travel dates?

USER: My travelling dates are July 30 to Aug 1.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I need a single connection of flight.

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, there is no flight available as per your requirements.

USER: No problem, thank you.

ASSISTANT: You are most welcome.