You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER:  I am Carol Adams. I want to change my reservation owing an emergency.

ASSISTANT: Sure, please wait for a minute.

USER:  Ok.

ASSISTANT: Sorry, we could not find any reservation on our name in data base.

USER: Thank you for your response.

ASSISTANT: Thank you for selecting us.