You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Angela Nelson. I am planning to book a ticket to attend a meeting at OAK. Can you please help me out from PHL.

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

USER: I would like to travel on 04/05 and return back on 04/07.

ASSISTANT: Let me check for the availability of flight.

USER: Sure, I will wait.

ASSISTANT: Angela, there is no flight available at your requested dates.

USER: That's fine, thank you for your service.