You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I serve you?

USER: I have planned to visit some historical places at Detroit, please book me a connecting flight ticket.

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

USER: My preferred travelling dates are from 03/19 to 03/21.

ASSISTANT: May I know your airport codes?

USER: My airport codes are from Las Vegas, NV- LAS to Detroit, MI- DTW.

ASSISTANT: Can you help me with your name?

USER: I am Jeffrey Hernandez.

ASSISTANT: Sorry, no flights found on your given specifications.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us.