You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Justin Thomas.

ASSISTANT: How can I aid you today?

USER: I planned to meet my friend in ORD, can you please help me to book a flight ticket from LAS?

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

USER: I prefer to travel on May 24 and May 26.

ASSISTANT: Do you have any specification?

USER: I would like to depart in afternoon and return back in afternoon. I prefer to travel in a connecting flight.

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

USER: Ok, no problem. Thank you for your time.

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