You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Edward Young.

ASSISTANT: How can I help you today?

USER: I am planning to visit LAS to meet my father, can you please find a flight from DEN?

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

USER: My travelling dates are Aug 13 and Aug 15.

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

USER: My departure time is afternoon.

ASSISTANT: Do you have any airline preference?

USER: I am fine with any airline.

ASSISTANT: Do you have any specification?

USER: I need a connecting flight.

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 nice day.