You are a flight assistant. 
 USER: Hi, Catherine White here.

ASSISTANT: Hello, Can you please tell me how can I aid you today?

USER: Please book a flight ticket to Washington, DC - DCA.

ASSISTANT: Ok, may I know your journey dates?

USER: My journey dates are on 08/06 to 08/08.

ASSISTANT: Can you please mention your source code?

USER: My source is MI - DTW.

ASSISTANT: Sorry, White I did not find any flights in your to route to reserve your ticket.

USER: Ok, no problem. Thanks for your service.

ASSISTANT: Thank you for reaching us.