You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you find a flight for me from IAD to JFK?

ASSISTANT: Could you please share your travelling dates?

USER: Ok, my trip dates are from Feb 27 to 29.

ASSISTANT: May I know your connection preference?

USER: I would like to depart in the morning time with single connection.

ASSISTANT: Ok, may I know your name?

USER: Sure, I am Anna Allen.

ASSISTANT: Sorry, there are no flights available on your travel dates.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for choosing us.