You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: Please help me to book a direct flight from PA to treat an emergency case in NV.

ASSISTANT: Sure, can you please share your journey dates?

USER: Sure, I need to depart on 03/13 and my return date will be on 03/15.

ASSISTANT: Are you looking for any preferred connections?

USER: Yes, I need a direct flight.

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

USER: No, please proceed.

ASSISTANT: Can  I have your name to proceed further?

USER: I am Elizabeth Moore.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

USER: That's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for opting us.