You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I had a fish shipping business in New York,  EWR. There is a problem in shipping, so I need to so there. So please book a flight ticket from IAD .

ASSISTANT: Sure, may I know your travelling dates?

USER: I want travel on these date 07/09 and 07/11.

ASSISTANT: Do you have any other requirements? Sorry to tell that there are no flights found on your requested dates.

USER: It's ok, thank you for searching.

ASSISTANT: Thank you for approaching us. May I know your name?

USER: I am Nancy Collins.

ASSISTANT: Thank you.