You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I am Jennifer Clark. I want to book a ticket from OAK to LAS, can you help me?

ASSISTANT: Sure, I am glad to help you in booking the flight ticket. May I know your planned travel dates?

USER: My travel dates are 06/30 and 07/02.

ASSISTANT: Sorry to say, there are no flights available for your desired dates.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for reaching us.