You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am planning to attend a client meeting in Denver on Sept 4th and my return date will be on Sept 6th, can you help me in booking?

ASSISTANT: Sure, can you share me your travelling airport codes?

USER: My boarding and landing airport codes are DTW and DEN.

ASSISTANT: Do you have any class preference?

USER: I would like to fly with the business class.

ASSISTANT: Is there any other specifications?

USER: I want to return in the morning.

ASSISTANT: May I know your name please.

USER: I am Brandon Nelson.

ASSISTANT: Sorry, no flights are found on your travel dates.

USER: No issues, I'll choose any alternative. Thank you.

ASSISTANT: Thank you for reaching us.