You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER:  I want to reserve a flight from DEN, as I have my brother's wedding event at IAH. Can you please help me out with it?

ASSISTANT: Sure, I am here to help you in booking. Can you please share your travel dates?

USER: Thank you, my planned travel dates are May 19th and May 21st.

ASSISTANT: May I know your connection limit?

USER: I prefer a direct flight for my journey.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: Ok, please let me know your name.

USER: My name is David Green.

ASSISTANT: Sorry, there is no direct flight available for you in this route as per your travelling details.

USER: Ok, no problem. Anyways, thank you for the information.

ASSISTANT: Thank you for choosing us.