You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I would like to book a flight ticket from LAS to IAD to meet my friends.

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

USER: My travelling dates are July 12 and July 14.

ASSISTANT: May I know your name for further process?

USER: I am Frank Phillips.

ASSISTANT: Do you have any specification?

USER: I want to return in the afternoon.

ASSISTANT: Please wait a moment. Sorry, no flights are available on your preferable travel dates.

USER: No worries, thank you for the information.

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