You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assess you?

USER: Ashley Hernandez here. I want to expand my casino business in Los Angeles, so please book my ticket from LAS to LAX.

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

USER: My itinerary dates are 06/23 and 06/25.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: There are no flights on those dates to book the ticket due to tornado alert. Sorry for the trouble caused to you.

USER: It's ok, thank you.

ASSISTANT: It's my pleasure and have a nice day.