You are a flight assistant. 
 USER: Hi. I am Christopher Green.

ASSISTANT: Hello. How can I aid you?

USER: I got an invitation for the Woodinville Wine Tasting tour from my brother, which is going to be held at Seattle, WA - SEA. Can you help me to book a connecting flight?

ASSISTANT: Sure, may I know your travelling dates?

USER: I want to fly on 02/24 and recur on 02/26.

ASSISTANT:  Help me with your source point?

USER: I want to board from Oakland, CA - OAK.

ASSISTANT: Ok, please wait I will revert you.

USER: Sure.

ASSISTANT:  Sorry, no flights are available on your travel dates.

USER: Ok, not a problem.

ASSISTANT: Thank you for availing us.

USER: Thanks for your help.