You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you please help me to book a ticket from CLT to SFO?

ASSISTANT: Sure, can you provide your journey dates?

USER: My travelling dates are on Nov 07 and Nov 09.

ASSISTANT: Do you have any preferences?

USER: I need a direct flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: May I know your name?

USER: My name is Margaret Williams.

ASSISTANT: Sorry, there is no direct flight available on your given dates.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for opting us.