You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Nicholas Wilson, can you find a flight from BOS to DCA?

ASSISTANT: Sure, may I know your travel dates?

USER: Ok, my journey starts at Oct 05 and returning on Oct 07.

ASSISTANT: Do you have any specifications?

USER: Yes, I would like to return in the afternoon time.

ASSISTANT: Sorry, there is no flight on your details.

USER: It's ok, no issues. Thanks for your information and service.

ASSISTANT: Thank you.