You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Will you please book me a direct flight to LAS?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: I will start on June 9th and return on June 11th.

ASSISTANT: May I know your good name please?

USER: I am Samantha Moore.

ASSISTANT: Can you please share your source airport code?

USER: I will be leaving from OAK.

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

USER: That's alright, thanks for your assistance.

ASSISTANT: Thank you for reaching us.