You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am planning to book a ticket to attend a meeting at SFO. Can you please help me out?

ASSISTANT: Sure, could I have your trip dates, please?

USER: I am planning to travel on Oct 30 and return back on Nov 01.

ASSISTANT: Kindly mention your source airport code.

USER: My source code is PHL.

ASSISTANT: Do you have any preferences?

USER: My return time should be afternoon.

ASSISTANT: May I know your good name?

USER: My name is Alexander Robinson.

ASSISTANT: Sorry, there are no flights available as per your requirements.

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

ASSISTANT: Thank you.