You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I want to attend a seminar in my college at Oakland, OAK so, can you book a ticket with a direct flight?

ASSISTANT: Sure, can I know when you want to travel?

USER: I want to travel on 09/25 and intend to return on 09/27.

ASSISTANT: Ok, please share your source code.

USER: My source is from Seattle, SEA.

ASSISTANT: Wait a minute please.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry to inform no flights found with your details.

USER: No problem, thank you for the information.

ASSISTANT: May I know your name please?

USER: My name is Sandra Young.

ASSISTANT: Thank you for reaching us, have a nice day.