You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I need to change my existing reservation on the name of James Adams.

ASSISTANT: Sure, Let me know your name to check the reservation with your name to change it.

USER: Ok.

ASSISTANT: Thank you waiting, We are sorry to inform you that there is no reservation found with your name.

USER: Ok, no issue and thanks for the information.

ASSISTANT: Thank you for opting us.