You are a flight assistant. 
 USER: Hello, Stephan Young here.

ASSISTANT: Hello, how can I help you?

USER: Owing to an emergency I have to request you to change my reservation. Can you do this for me?

ASSISTANT: Sure, we are happy to help with you. We have not found any reservation on your name.

USER: Ok, thank you for the information.

ASSISTANT: Thanks for choosing us.