You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Please help me in booking my flight ticket from SFO to OAK?

ASSISTANT: Sure, can I know the travel dates please?

USER: My travelling dates are 02/23 and 02/25.

ASSISTANT: Ok, wait a moment please.

USER: Ok.

ASSISTANT: May I know your name please?

USER: Myself Jessica Lewis.

ASSISTANT: Sorry Lewis, there are no flights available on your dates.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for approaching us.