You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Can you reserve a seat for me in a flight from DFW to DEN?

ASSISTANT: Your travelling dates please?

USER: Ok, my planned dates are from July 11 to 13.

ASSISTANT: Do you have any connection limit?

USER: I need a flight in normal-cost with 1 connection.

ASSISTANT: Is there any specifications?

USER: No.

ASSISTANT: May I know your name please?

USER: Ok, I am Dennis Carter.

ASSISTANT: I am sorry no flights found on your route.

USER: It's ok, thank you.

ASSISTANT: Thank you for choosing us.