You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you today?

USER: I am William Parker want to visit MSP, can you book a ticket from IAD?

ASSISTANT: Sure, I am oblige to help you with that. Can you please provide your planned dates of travelling?

USER: Sure, my travelling dates will be 09/02 and 09/04.

ASSISTANT: Please wait a moment to check the flights.

USER: Ok.

ASSISTANT: We regret to inform you that there are no flights moving to your region with your planned dates of travelling.

USER: Thank you for reaching us, have a nice day.

ASSISTANT: Thank you for reaching to our services, hope you have a great day.