You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you for today?

USER: I am Jerry Jackson here. I would like to change my existing reservation, which is done recently. Can you please help me out?

ASSISTANT: I am here to help you about that Jerry Jackson.

USER: Thank you for considering my request.

ASSISTANT: Please wait to check the reservation status with your name in our booking list.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to say this Jerry Jackson, there is no active reservation with your name to change your reservation.

USER: Not a big problem, anyway thank you for the information.

ASSISTANT: You are welcome, thank you for choosing our service.

USER: Thank you for your service.