You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Due to postponement of my exams, I want to change my reservation with the name of Samuel Turner.

ASSISTANT: Ok. Please, hold on.

USER: Sure.

ASSISTANT: No reservation found on your name.

USER: Not an issue. Thank you for your response.

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