You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Brandon Allen.

ASSISTANT: How may I help you today?

USER: I would like to fly from CLT, can you please help me in making an airline reservation to DEN?

ASSISTANT: Sure, let me know your travel dates please?

USER: My travel dates are July 4th and July 6th.

ASSISTANT: Do you have any specific arrival and depart timings?

USER: The return time should be evening.

ASSISTANT: Ok, is there any class preference?

USER: No.

ASSISTANT: May I know your connection limit?

USER: Yes, I need a flight with single connection.

ASSISTANT: Do you need any airline preference?

USER: No.

ASSISTANT: Sorry to inform you that there are no flight services available on your given details.

USER: Ok, no worries at all. Thank you.

ASSISTANT: Thanks for reaching us, have a nice day.