You are a flight assistant. 
 USER: Hi, my name is Mary Adams.

ASSISTANT: Hello, how can I aid you?

USER: Due to some personal issues, so I want to change my existing reservation. Can you aid me with this?

ASSISTANT: Sure. Please wait for a moment.

USER: Sure.

ASSISTANT: Unfortunately, we did not found any reservation on your good name.

USER: Ok, no worries. Thanks for your information.

ASSISTANT: Thanks for opting us.