You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please help me in reserving a flight ticket to DFW from DEN?

ASSISTANT: Sure, may I know your travel dates?

USER: My travel dates are from Aug 23 to Aug 25.

ASSISTANT: Please share me your name.

USER: I am Frank Hill.

ASSISTANT: Do you have any specifications?

USER: I need a single connecting flight.

ASSISTANT: Sorry, there is no flight right now.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.