You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Margaret Evans here. Do you have any flight from DTW to SFO, I want to attend a business meeting in San Francisco?

ASSISTANT: Ok, please mention your trip dates too.

USER: My trip dates are 02/27 and 02/29.

ASSISTANT: Sorry Margaret Evans, there is no flight found on your route.

USER: That's fine, thanks for your information.

ASSISTANT: Thanks for contacting us.