You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Scott Jackson.

ASSISTANT: How can I assist you?

USER: I am planning to go my hometown on 03/26 to celebrate my granny's birthday at Oakland, CA-OAK. Can you help me with booking a flight with single connection flight?

ASSISTANT: Sure, I will help you for booking. Can you please provide me your source airport code?

USER: Sure, it's Washington, DC-DCA.

ASSISTANT: Ok, when you are going to start your journey from DCA?

USER: I will back on 03/28.

ASSISTANT: Ok, give me a moment.

USER: Sure.

ASSISTANT: Sorry, there is no flight is available on your route.

USER: Ok, no problem. Thank you.

ASSISTANT: Welcome.