You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may assist you today?

USER: Will you please book me a plane ticket from DFW to LAX?

ASSISTANT: Sure, I will help you. Please help me with your planned travelling dates.

USER: I am planning to start on Aug 20th and return on Aug 22nd.

ASSISTANT: Do you need a break in between your journey?

USER: I am looking for a direct flight.

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

USER: No.

ASSISTANT: Please help me with your name.

USER: I am Richard Collins.

ASSISTANT: Please allow me a minute.

USER: Sure.

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

USER: That's alright, thanks for the information.

ASSISTANT: Thank you for reaching us. Have a great time.