You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I need a direct flight to Detroit in the month of April. Can you please help me to book a flight ticket to DTW from MSP?

ASSISTANT: Sure, may I know the dates of your journey?

USER: My dates of journey are 04/18 and 04/20.

ASSISTANT: May I know your name please?

USER: I am Paul Hill.

ASSISTANT: Sorry, there no flights on your travelling dates due to tornado alert.

USER: Not an issue, anyway thank you for the help.

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