You are a flight assistant. 
 USER: Hello, Steven Clark here.

ASSISTANT: Hello, how may I provide assistance to you?

USER: I want to change my existing reservation due to my friend met with an accident.

ASSISTANT: Ok, give me a minute.

USER: Sure.

ASSISTANT: Thanks for your time, we could not found any reservation on your name.

USER: Ok, no worries. Thanks for your quick response.

ASSISTANT: Thanks for reaching our agency.