You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be at your service?

USER: I am Stephanie Scott.

ASSISTANT: Ok.

USER: I want to book a ticket from PHL to LAS, can you please book a direct flight?

ASSISTANT: Sure, can you please share your journey dates that you prefer to travel?

USER: I will depart on 01/27 and return on  01/29.

ASSISTANT: Do you have any other restrictions to be met?

USER: I need a flight up to 1000.

ASSISTANT: Ok, please wait a moment, let me search a flight for you.

USER: Sure.

ASSISTANT: Sorry to say this, no flights will run on that particular location due to tornado alert.

USER: Okay, thank you.

ASSISTANT: Thank you for choosing us, hope to serve you better next time.