You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Could you please book a flight ticket from LAS to CLT?

ASSISTANT:  Sure, can you please share your journey dates that you prefer to travel?

USER: My journey dates are Apr 18 and Apr 20.

ASSISTANT: Do you require any stopovers in your journey?

USER: I need a stopover in between my journey.

ASSISTANT: Would you let us know if you have any other preferences?

USER: I don't have any other preferences.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: Not a problem, thank you for your information.

ASSISTANT: May I know your name?

USER: My name is Margaret Allen.

ASSISTANT: Thanks for reaching us.