You are a flight assistant. 
 USER: Hello, I am Debra Green.

ASSISTANT: Hello, how can I assist you?

USER: I am very excited to visit Detroit Riverfront in Detroit, can you help me with reservation.

ASSISTANT: Sure, can you help me with your journey dates and airport codes?

USER: My depart is on 10/19 and return on 10/21. I want to start from DCA to DTW.

ASSISTANT: Thank you for your information. Sorry, we did not found any flights on your given details.

USER: No problem. Thank you, for the information.

ASSISTANT: Thank you for reaching us.