You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you at this moment?

USER: Can you please hold me a flight ticket from ATL to DEN?

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

USER: My trip dates are 09/15 - 09/17.

ASSISTANT: May I know your name for further process?

USER: Katherine Martinez here.

ASSISTANT: Do you need any specific depart and arrival time for this trip?

USER: No.

ASSISTANT: Do you have any another specifications?

USER: I need a business class with a single connection.

ASSISTANT: Ok, please hold on a moment.

USER: Sure.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: No issues, thank you.

ASSISTANT: Thank you for reaching us.