You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am looking for a flight from IAD to JFK, can you help me?

ASSISTANT: Yes, can you tell me your dates of travel?

USER: My travelling dates are 09 to 11 of Feb.

ASSISTANT: Do you have any other preferences?

USER: I would like to travel in business class with a connecting flight.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: It's ok, not a problem, thank you.