You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How can I support you today?

USER: I would like to return on 05/06 after completing my research at New York. Can you help me book a flight ticket from Oakland on 05/04?

ASSISTANT: Sure, Where are your boarding and landing points?

USER: My journey is from OAK to JFK.

ASSISTANT: Ok, please wait. Let me search you with the flight.

USER: Ok.

ASSISTANT: Thanks for waiting. Unfortunately, there is no flight found on your routes for your journey.

USER: It's ok, thank you.

ASSISTANT: May I know your name?

USER: Christopher White is my name.

ASSISTANT: Ok, Thanks for visiting us.