You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Jennifer Taylor.

ASSISTANT: How can I serve you?

USER: Can you please reserve a flight ticket from OAK to SFO?

ASSISTANT: Sure, May I know your journey dates?

USER: My journey dates are, depart on Aug 16th and return on Aug 18th.

ASSISTANT: Do you have any preferences?

USER: I need a direct flight.

ASSISTANT: Thanks for your details.

USER: Ok.

ASSISTANT: There are no direct flights available to your destination.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.