You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Thomas Anderson.

ASSISTANT: How can I guide you today?

USER: I would like to book a flight ticket to meet my friend in Las Vegas, can you help me for booking a flight ticket from BOS to LAS?

ASSISTANT: Sure, I am here to help you in booking. Can you please share your travel dates?

USER: My travelling dates are Oct 01 and Oct 03.

ASSISTANT: May I know your departure time and return time?

USER: My departure time is evening.

ASSISTANT: Do you have any specification?

USER: I need a direct flight in my journey.

ASSISTANT: Sorry, no flights are available on your preferable travel dates.

USER: That's ok, thank you for checking.

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