You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: Patrick Evans here. Can you please reserve a flight ticket from JFK to ORD for a business meeting.?

ASSISTANT: Sure, I am gleeful to help you. May I know the dates of your journey?

USER: Thank you, I am planning to move on 02/17 and please book my return ticket on 02/19.

ASSISTANT: Please give me a moment to find the flight on your dates.

USER: Ok, take your time to check but try to bring a best flight in my route.

ASSISTANT: I am unable to find a flight on the dates which you have mentioned due to tornado alert.

USER: Oh! So sad to hear that. Anyway, I will find another way to go there. Thank you for the information.

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

USER: Welcome.