You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: My name is Nicole Davis, I want to book a flight from SFO to meet my parents. Can you book a direct flight for me?

ASSISTANT: Sure, please share me your trip dates.

USER: I will travel on Dec 17 and return on Dec 19.

ASSISTANT: Please share me your destination airport.

USER: My destination airport code is PHL.

ASSISTANT: Do you need any specifications?

USER: No.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.