You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I want to attend a conference in Boston, can you book a ticket from DCA to BOS?

ASSISTANT: May I know your travelling dates?

USER: My trip dates are 03/27 and 03/29.

ASSISTANT: May I know your name?

USER: My name is Ruth Walker.

ASSISTANT: Sorry. There is no flight as per your requests.

USER: No problem. Thank you for searching.

ASSISTANT: Thank you for choosing us, have a nice day.