You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in booking from DEN to DFW?

ASSISTANT: Sure, can you please share me your travelling dates?

USER: My travelling dates are from Aug 7 to Aug 9.

ASSISTANT: Do you have any connection limit?

USER: I need a direct flight.

ASSISTANT: Is there any other specifications?

USER: I prefer economy class.

ASSISTANT: May I know your name?

USER: My name is Alexander Miller.

ASSISTANT: Sorry, there were no flights with your given details.

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for reaching us.