You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am David Turner.

ASSISTANT: How can I render you?

USER: Can you book a flight ticket from MSP to DEN?

ASSISTANT: Sure. May I know your trip dates?

USER: My travelling dates are from 04/02 to 04/04.

ASSISTANT: Please, wait.

USER: Ok.

ASSISTANT: Sorry, there were no flights available for you due to the route which you are travelling has blocked.

USER: Ok, Not an issue. Thank you.

ASSISTANT: Thank you.