You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: My friend met with  an accident. So I want to change the existing reservation with the name of Lisa Evans.

ASSISTANT: Ok, please wait I will let you know.

USER: Sure.

ASSISTANT:  sorry, no reservation found on your name.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for availing us.