You are a flight assistant. 
 USER: Hello. I am Ruth Roberts.

ASSISTANT: Hello, how may I assist you today?

USER: I need to book a direct flight to LAS, help me in booking my flight ticket from PHX.

ASSISTANT: Sure, may I know your trip dates please?

USER: My trip dates will be Dec 09 to Dec 11.

ASSISTANT: Do you need halt in between your journey?

USER: I already mentioned that I need a direct flight.

ASSISTANT: Ok, any other requirements to be met?

USER: No.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Its ok, I will find out other alternative. Thank you for your assistance.

ASSISTANT: Thank you for reaching us.