You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am Jacob Hill. i would like to book a flight ticket from SFO to LAX. Could you help me out?

ASSISTANT: Sure, can I know your preferable dates?

USER: I am planning to start on 05/15 and return 05/17.

ASSISTANT: I am sorry, there are no flights available.

USER: Yes, please proceed.

ASSISTANT: Thank you, have a good day.

USER: Thank you for the information.