You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know how best I can help you today?

USER: I am Katherine Young. I want to take my children to Oakland, can you please help me to book a flight ticket from SEA to OAK?

ASSISTANT: Sure, can you please let me know your travelling dates?

USER: Sure, my travel dates are Mar 07 and Mar 09. My departing time is morning.

ASSISTANT: Sorry to say, there are no flights in the morning.

USER: That's ok, thank you for your information.

ASSISTANT: Your welcome.