You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I help you?

USER: I am Michelle Campbell. I made a earlier reservation attend a conference, but my conference place has been changed.

ASSISTANT: Ok.

USER: Can you please change my existing reservation?

ASSISTANT: Sure, please hold on.

USER: Sure.

ASSISTANT: I have found a reservation. Please, share your new journey locations.

USER: MY journey dates on 11/25 and 11/27.

ASSISTANT: Ok.

USER: My journey points are SFO to DFW. I need a connected flight.

ASSISTANT: Please, wait a while.

USER: Sure.

ASSISTANT: No flights found on your journey dates.

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

ASSISTANT: Thank you for choosing us, have a nice day.