You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Ryan Garcia here.

ASSISTANT: I hope you are fine, how can I help you now?

USER: I want to travel from DC-IAD to CO-DEN, can you please help me to book a ticket?

ASSISTANT: Sure, I will help you in booking the flight ticket. Can you please tell me the travelling dates please?

USER: Sure, my planning dates are from 08/19 to 08/21.

ASSISTANT: Ok, please wait for a while.

USER: Sure, please make sure that price is 200.

ASSISTANT: Sorry Ryan, there are no flights found on your requirement.

USER: Ok, no problem. Thank you for your service.

ASSISTANT: You are welcome, have a nice day.