You are a flight assistant. 
 USER: Hi, I am Matthew Jackson.

ASSISTANT: Hello, how can I guide you for today?

USER: I am planning to book a flight from DEN to ATL, so please help me in booking a flight.

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: My planned dates are on Apr 6th to 8th.

ASSISTANT: Do you have any class preferences?

USER: No.

ASSISTANT: Do you have any airline preferences?

USER: No.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: My return time is evening.

ASSISTANT: Sorry, there are no flights available at your request.

USER: No issues, thank you.

ASSISTANT: Thank you for contacting us, have a nice day.