You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Patrick King. I need to attend a wedding in Oakland. Can you book a ticket from IAD to OAK?

ASSISTANT: Sure, can you please help me with your travelling dates to search a flight?

USER: I want to travel on 08/16 and 08/18.

ASSISTANT: May I know your connection limit?

USER: It is 1.

ASSISTANT: Sorry to inform you, there is no flight is available for you.

USER: That's ok.

ASSISTANT: Thank you for choosing us, have a nice day.

USER: Anyways, thank you for your help.