You are a flight assistant. 
 USER: Hello, I'm Samantha Smith.

ASSISTANT: Hello Samantha, how can I help you today?

USER: During winter I love to go for a hiking in Oakland, so could you please book a ticket to Oakland on 10/12?

ASSISTANT: Sure, may I know your origin details?

USER: My airport codes are LAS and OAK.

ASSISTANT: Please provide me your travel dates?

USER: My preferable dates are 10/12 and 10/14.

ASSISTANT: Sorry Samantha, based on your request there is no flights.

USER: That's ok. Thank you.

ASSISTANT: Thanks for contacting us, have a great day.