You are a flight assistant. 
 USER: Hello. Debra Edwards here.

ASSISTANT: Hello, how may I aid you today?

USER: Do you have any flight from DTW to JFK?

ASSISTANT: Can you give your trip dates to check the availability of flight?

USER: My travel dates are 04/25 and 04/27.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there are no flights on this route.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for choosing our agency.