You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Steven Turner.

ASSISTANT: How may I help you?

USER: Owning to am emergency I want to change my existing reservation. Can you please help me with this?

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: Sorry, there is no active reservation found under your name in our records.

USER: Ok, no problem. Thank you for checking.

ASSISTANT: Most welcome.