You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Larry Collins.

ASSISTANT: How may I guide you today?

USER: I am planning to visit Atlanta, will you help me in booking the flight ticket from DEN to ATL?

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

USER: My preferable journey dates are May 21 and May 23.

ASSISTANT: Do you have any specifications?

USER: I need a flight with single connection which departs in afternoon time.

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

USER: Ok, not an issue. Thank you for your response.

ASSISTANT: Thank you for reaching us.