You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I be of your helping hand?

USER: I am Amy Lopez, I want to change my existing reservation due to my meeting got delayed. Can you be my helping hand?

ASSISTANT: Sure, we will help you.

USER: Thank you.

ASSISTANT: May I know your name to check your details in reservation list?

USER: I already mentioned above, please check it.

ASSISTANT: Ok, please wait for sometime.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no active reservation found on the name Amy Lopez.

USER: Ok, thank you for your prompt response.

ASSISTANT: Thank you for choosing our service.