You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I need to attend a seminar at Washington, can you please help me with flight ticket booking from DEN to DCA locations?

ASSISTANT: Sure, can you please share your preferable journey dates?

USER: Thank you for your positive response and I want to take off on Oct 31 and I will recur back on Nov 2.

ASSISTANT: Can you please share your name?

USER: Sure, my name is Amy Walker.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a single connected flight.

ASSISTANT: Is there any specifications?

USER: No, thanks for asking.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: Sad to hear that one, thank you for your search and providing the information.

ASSISTANT: Thank you for reaching us.