You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me in booking a flight ticket from Las Vegas, LAS to Philadelphia, PHL?

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

USER: My journey dates are from Dec 14 to Dec 16.

ASSISTANT: Let me know your connection limit.

USER: I am ok with any connection.

ASSISTANT: Do you have any specification?

USER: No.

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

USER: Ok, that's not a problem. Thanks for your information.

ASSISTANT: May I know your name for documentation purpose?

USER: My name is Eric Brown.

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