You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: Can you aid me in booking a flight ticket from OAK to DEN?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your travel dates please?

USER: I am planning to start on July 30th and return back on Aug 1st.

ASSISTANT: Ok, do you have any specifications?

USER: Make sure that conection limit is 1.

ASSISTANT: May I know your name please?

USER: Larry Parker.

ASSISTANT: Sorry Larry Parker, there are no flights available on your requested dates.

USER: No issues. Thank you for checking.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.