You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Paul Anderson.

ASSISTANT: How can I assist you today?

USER: Can you please check whether there are any flights available on 02/26 and 02/28?

ASSISTANT: Sure, can you please help me with the airport codes?

USER: Sure, I want to fly from IAD to DEN.

ASSISTANT: Ok, let me check for the availability of flight.

USER: Ok.

ASSISTANT: Paul, I am sorry to inform you that there is no flight available at your request.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for contacting us.