You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I oblige you today?

USER: Frank Williams here, can you please help me out in booking the ticket from DTW to IAD? As I'm planning to visit Disney world at Washington.

ASSISTANT: Sure, we are rapturous to help you. Sure, can you please share your journey dates that you prefer to travel?

USER: Sure, my planned travel dates are 03/23 and 03/25.

ASSISTANT: I am sorry there are no flights on your route.

USER: Oh! That's ok, thank you for giving the information.

ASSISTANT: Your welcome.