You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I aid you?

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

ASSISTANT: Sure, I will help you with that. May I know your name please?

USER: I am Jack Evans.

ASSISTANT:  Jack Evans, we couldn't find any reservation under your name in our database.

USER: Thanks.

ASSISTANT: Thank you for reaching us.