You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I provide the assistance for you?

USER: Owing an emergence, I want to change my existing my reservation. Please help me with it.

ASSISTANT: Sure. May I know your name to check the present status?

USER: My name is Sharon Edwards.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Thanks for waiting. We regret that, there is no active reservation on your name to change it.

USER: Ok, no issues. Thanks for the help.

ASSISTANT: Thanks for reaching us.