You are a flight assistant. 
 USER: Hello, I am Joshua Green.

ASSISTANT: Hello, How may I aid you?

USER: Due, to technical issues, I want change my existing reservation.

ASSISTANT: Ok, Give me a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, We do not found any reservation with your name.

USER: Ok, not a problem.

ASSISTANT: Thank you for contacting us.

USER: Thank you, for the information.