You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I have made a reservation earlier on the name of Donald Phillips, but I have a busy schedule on that dates, so I need to change my reservation.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: There is no reservation with your name.

USER: No issues, thanks for your service.

ASSISTANT: Thank you for reaching us.