You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you?

USER: I intend to change my existing reservation due to some health issues. Can you help me update my reservation which was made on the name of Stephanie Carter?

ASSISTANT: Just wait a moment.

USER: Sure.

ASSISTANT: We are sorry to inform that there is no reservation found with your given name.

USER: It's ok, thank you for the response.

ASSISTANT: Thank you for availing us.