You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I made a reservation earlier on the name of Sarah Jones, but due to some issues I need to change my reservation.

ASSISTANT: Sure, please wait a while.

USER: Ok, I will wait.

ASSISTANT: Thank you for your time. We didn't found any reservation with your name.

USER: No problem, thanks for your quick response.

ASSISTANT: Thank you for opting us.