You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I intend to change my existing reservation which was made on the name of Alexander Nelson due to some reasons. Can you help me with it?

ASSISTANT: Sure, please wait a minute.

USER: Sure.

ASSISTANT: There is no reservation with your name.

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

ASSISTANT: Thank you for reaching us.