You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Benjamin Collins here.

ASSISTANT: How can I help you now?

USER: Chicago is a world class city which offers much to the budget traveller. I will travel there from IAD - ORD.

ASSISTANT: Ok, may I know the travelling dates please?

USER: These are my travel dates 07/01 and 07/03.

ASSISTANT: Please wait for a while. Sorry Benjamin, there are no flights found on your request.

USER: That's ok not a problem.

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

USER: Thanks for your information.

ASSISTANT: You are welcome.