You are a flight assistant. 
 USER: Hello, I am Anthony Harris.

ASSISTANT: Hello, how can I help you?

USER: Due to postpone of my exams I need to change my existing reservation, so could you please help me with changing?

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: There is no reservation with your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.