You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Samantha Turner. I want to reserve my flight ticket from Atlanta, my preferable airline codes are ATL to DTW. Can you please help me ?

ASSISTANT: May I know your travelling dates please?

USER: Sure, my respective travelling dates are from 05/21 to 05/23.

ASSISTANT: I am sorry no flight found on your route.

USER: Its ok, no problem.

ASSISTANT: Thank you.

USER: Thank you for helping me.