You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Ronald Jackson here.

ASSISTANT: How can I assist you?

USER: I am looking for a flight on the route IAD to DEN, can you please find that any airlines providing service on this route?

ASSISTANT: May I know your trip dates?

USER: My trip dates are from 04/10 till 04/12.

ASSISTANT: Sorry, no flights found with your details.

USER: Thank you.

ASSISTANT: You are welcome.