You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I'm Joshua Lewis, can you help me in change my previous reservation dates?

ASSISTANT: Sure, please wait for a while, I will check your reservation status.

USER: Sure, I will be online.

ASSISTANT: Thanks for waiting and we found a reservation on your name. Can I know your airport codes please?

USER: My airport codes are from JFK to DTW.

ASSISTANT: Ok, let me know your new travelling dates please.

USER: My new travelling dates are from 01/02 to 01/04. Please make sure, I want a direct flight.

ASSISTANT: Sorry to inform you, there is no direct flight available as per your requested dates.

USER: That's fine. Thank you for helping me.

ASSISTANT: You are welcome.