You are a flight assistant. 
 USER: Hello, my name is Donna Miller.

ASSISTANT: How can I provide assistance to you today?

USER: I want to attend for an emergency surgery in Philadelphia, PA - PHL. Can you aid me for booking with a direct flight?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are on 09/01 to 09/03.

ASSISTANT: what is your landing airport code?

USER: I am heading from Las Vegas, NV - LAS.

ASSISTANT: Sorry to say that, no flights were found on your desired route.

USER: That's Ok, thanks for your help.

ASSISTANT: Thank you for reaching us.