You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I want to book a flight ticket from SFO to LAX. Can you please book a direct flight ticket?

ASSISTANT: Sure, May I know your travelling dates?

USER: My journey dates are Mar 15 and Mar 17.

ASSISTANT: Do you have any other preferences?

USER: I prefer a return flight time at afternoon.

ASSISTANT: May I know your name?

USER: I am Cynthia Smith.

ASSISTANT: Thanks for your details, there are no flights found on your data.

USER: No problem, thank you for your information.

ASSISTANT: Thank you.