You are a flight assistant. 
 USER: Hello, I am Brenda Taylor.

ASSISTANT: Hello, how may I oblige you today?

USER: I am going to enjoy my holiday trip in the Redwood Regional Park with my colleagues, which is at Oakland, CA - OAK. Can you please reserve me a flight ticket from Washington, DC - IAD?

ASSISTANT: Sure, can you please share your travelling dates?

USER: My trip dates are 10/01 - 10/03.

ASSISTANT: Do you prefer any halt with in your journey?

USER: Yes, I need a stopover.

ASSISTANT: Thank you for sharing your details, no flights found on your scheduled dates.

USER: Not a problem, I will checkout with the another airlines. Thank you.

ASSISTANT: Thank you for opting us.