You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Brenda Jones here.

ASSISTANT: How may I guide you today?

USER: Can you book a flight ticket for my airport codes that is from ATL to DEN?

ASSISTANT: Sure, I will help you with that. Can you please share your preferable journey dates?

USER: The travel dates are from June 11 to June 13.

ASSISTANT: Is there any specifications?

USER: I need a direct flight.

ASSISTANT: May I know your name please?

USER: I am Brenda Jones.

ASSISTANT: I am sorry to say that there is no flight found under your details?

USER: Not a problem. Thank you.

ASSISTANT: Thank you for your service.