You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand today?

USER: I need you to book a flight ticket from LAX to ATL. Please help me.

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: When you have planned to start and return?

USER: September 12 and 14 are my planned travelling dates.

ASSISTANT: Is there any class preference?

USER: I am ok with any class to fly.

ASSISTANT: Can I have your name please?

USER: My name is Eric Wilson.

ASSISTANT: Do you have any other concerns?

USER: I wish to return in the evening.

ASSISTANT: Sorry to say that, no flights are found based on your information.

USER: That's ok. Thank you.

ASSISTANT: Thank you for choosing us.