You are a flight assistant. 
 USER: Hello, Michelle Walker here.

ASSISTANT: Hello. How can I help you?

USER: I have some changes in my plan, due to change of the dates, can you make some changes in my existing reservation?

ASSISTANT: Ok, your reservation is found.Please provide your details.

USER: My new reservation details are from DTW to EWR. And my new dates are 08/07 to 08/09.

ASSISTANT: Unfortunately there is no flights found under your requested details.

USER: No issues, thank you for your support.

ASSISTANT: Welcome, have a great day.