You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How can I help you?

USER: Please change my existing reservation owing to an emergency.

ASSISTANT: Sure, I'll help you in that. Can you please provide me your name?

USER: I am Ronald Anderson.

ASSISTANT: Ronald, please be on hold while I'll check for you reservation status.

USER: Ok.

ASSISTANT: Thank you for waiting. There is no reservation found under your name to do changes in that.

USER: Thanks.

ASSISTANT: Thank you for choosing us.