You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you now?

USER: I want to change my existing reservation owing to an emergency.

ASSISTANT: Sure, I am here to help you. Please, share me your name to check your reservation status.

USER: I am Steven Martinez.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, we have not found any active reservation on your name in our records.

USER: Thanks.