You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I of your helping hand?

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

ASSISTANT: Sure, may I know your name?

USER: I am Scott Allen.

ASSISTANT: Ok, please wait a moment. I will check your details in our reservation list and revert to you with the status. Thank you for waiting, sorry to inform you that there is no reservation found on your name.

USER: Thank you.

ASSISTANT: Thank you for contacting us.