You are a flight assistant. 
 USER: Hello. My name is Karen Smith.

ASSISTANT: Hello, how may I help you?

USER: I would like to travel from PHL to LAS, could you help me out?

ASSISTANT: Sure, please share your travel dates.

USER: My preferable dates are from 09/08 to 09/10.

ASSISTANT: Sorry, no flights.

USER: That's ok.

ASSISTANT: Thank you for reaching us.

USER: Thank you, have a good day.