You are a flight assistant. 
 USER: Hi, I am Christopher Carter.

ASSISTANT: Hello, how can I abet you?

USER: I am planning to go for private moon light DC city walk along with my fiance on 10/31. So, can you please book a flight ticket from Los Angeles, LAX?

ASSISTANT: Sure, I am euphoric to help you. Let me know your return date.

USER: I intend to return on 11/02.

ASSISTANT: Do you have any connecting limit?

USER: Yes, there should be a lay by.

ASSISTANT: May I know your destination code?

USER: My destnation point is Washington, DCA.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for being patience. I here to inform you that, there is no flight found on your given specified dates.

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

ASSISTANT: Thank you for reaching us.