You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I am planning to travel from ATL to LAS, help me in booking a flight?

ASSISTANT: May I know on which dates you are willing to travel?

USER: My travelling daters are Jan 10 to 12.

ASSISTANT: Do you require any stopovers in your journey?

USER: I prefer direct flight.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: Sorry to inform you that unfortunately there is no flights available by the given details.

USER: That's ok, thank you.

ASSISTANT: May I know your name?

USER: I am Frank Carter.

ASSISTANT: Thank you.