You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please book a flight ticket from DCA to OAK?

ASSISTANT: Sure, please share your planned trip dates?

USER: I am planning to travel on dates May 21 and May 23.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a break in between the journey.

ASSISTANT: May I know your name?

USER: My name is Jeffery Johnson.

ASSISTANT: Any other requirements to be met?

USER: No.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: That's fine, thank you for the response.

ASSISTANT: Thank you for reaching us.