You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Can you please book me a ticket from ORD to LAX?

ASSISTANT: Sure, I will help you. Please help me with your name.

USER: I am Christine Roberts.

ASSISTANT: Please help me with your planned travelling dates.

USER: I will start on Mar 17 and return on Mar 19.

ASSISTANT: Do you need a break in your journey?

USER: Yes, I need 1 stop over.

ASSISTANT: Please help me with your preferred class to fly.

USER: I am fine with any class.

ASSISTANT: Do you have any other preferences in your journey?

USER: No.

ASSISTANT: Please allow me a minute.

USER: Sure.

ASSISTANT: Christine Roberts, I am really sorry to inform you that there are no flights available for your journey.

USER: That's Ok, thanks for checking.

ASSISTANT: Thank you for reaching us. Have a good time!.