You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I guide you?

USER: I want to book a ticket from DTW to DCA, can you help me?

ASSISTANT: Please tell me your trip dates.

USER: My travel dates are 04/16 and 04/18.

ASSISTANT: Please can I know your name?

USER: I am Anthony Hall.

ASSISTANT: Sorry, no flight is available on your route DTW to DCA.

USER: No problem, thanks for checking.

ASSISTANT: My pleasure, have a nice day.