You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Jennifer Jackson, could you please help me in changing my existing reservation. Please help me in changing?

ASSISTANT: Sure, please wait. thank you for waiting, we found a reservation on your name. Could you please share your new reservation details?

USER: Ok, my new journey is from IAD to JFK. My trip dates are 09/05 to 09/07. I need a direct flight.

ASSISTANT: Sorry, no flights were found based on your schedule.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us.