You are a flight assistant. 
 USER: Hello, I am Eric Allen.

ASSISTANT: Hello, how may I support you today?

USER: I want to book a connected flight to go for business trip to Washington, DC - DCA. Can you please book a ticket on 11/25 to 11/27?

ASSISTANT: Sure, help me with your source point.

USER: My nearest boarding airport is Oakland, CA - OAK.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for your time, no flights were found based on your schedule.

USER: Ok, not a problem. Thanks for your help.

ASSISTANT: Thank you for visiting us.