You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Patrick Wilson want to book a ticket to New York, can you please aid me in booking?

ASSISTANT: Sure. Can I know your travelling dates?

USER: My travel dates are from 05/10 to 05/12.

ASSISTANT: Please share me your comfortable airport codes.

USER: My airport codes are from DCA to JFK.

ASSISTANT: Please wait a while.

USER: Ok.

ASSISTANT: Thanks for your time. Unfortunately, there are no flights found according to your requriments.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.