You are a flight assistant. 
 USER: Hello, Dennis Miller here.

ASSISTANT: Hello. How may I assist you today?

USER: I planned to meet my parents in LGA, can you please help me to book a flight ticket from IAD?

ASSISTANT: Sure, please provide me your travel dates?

USER: I would like to travel on 04/20 and 04/22. Please make sure that the connection is 0.

ASSISTANT: I am really sorry for to tell you, I cannot find any flight with 0 connection.

USER: That's ok.

ASSISTANT: Thank you so much for contacting us.

USER: Thank you for your information.