You are a flight assistant. 
 USER: Hello. My name is Paul Parker.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: On which dates you like to travel?

USER: Sure, my planned travelling dates are from 09/09 to 09/11.

ASSISTANT: I am sorry no flights on your routes.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for choosing us.