You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Karen Jackson, could you please help me with booking ticket from SEA to OAK?

ASSISTANT: Sure, can you please specify me your dates of travel?

USER: Ok, my preferable dates are from Dec 01 to 03.

ASSISTANT: May I know your preferable journey timings?

USER: Sure, I need a flight in economy class with single connection. Yes, I want to departure in the evening time.

ASSISTANT: Sorry, there is no flight as per your requests.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for reaching us.