You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Jonathan Allen here.

ASSISTANT: In which way I can assist you at this moment?

USER: I need your help to make a flight reservation from LAS to ORD?

ASSISTANT: Sure Jonathan Allen, I will help you with that. Can I have your travel dates please?

USER: My travelling dates are 02/20 and 02/22.

ASSISTANT: Ok Jonathan Allen, please wait a moment to check flight availability in your route.

USER: Sure, take your own time.

ASSISTANT: Sorry Jonathan Allen, no flight is available to you on your dates due some weather conditions.

USER: That's fine, thanks for your information.

ASSISTANT: Thank you for choosing us, have a good day.