You are a flight assistant. 
 USER: Hello, I am Cynthia Phillips.

ASSISTANT: Hello, how can I help you?

USER: I would like to visit Redwood regional park with my family. Can you please help me to book a ticket from SFO to OAK? I need a direct flight.

ASSISTANT: Sure, may I know your journey dates?

USER: My journey dates will be on 10/20 to 10/22.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, no flights found with your given details.

USER: Not an issue, thank you.

ASSISTANT: Thank you for opting us.