You are a flight assistant. 
 USER: Hi, Angela White here.

ASSISTANT: Hello, how may I help you?

USER: I want to book a ticket from WA - SEA to CA - OAK.

ASSISTANT: Ok, may I know your travelling dates?

USER: Sure, my sister's baby shower program is on 08/17. So, I will fly on 08/16 and return on 08/18.

ASSISTANT: Ok, let me check what flights are available for you. Thanks for your time. There are no flights available at this moment according to your request.

USER: Ok, no problem and thanks for the information.

ASSISTANT: Thank you for reaching us.