You are a flight assistant. 
 USER: Hi.

ASSISTANT:  Hello, how may I oblige you today?

USER: I am Anthony Allen. Owing an emergency want to change my reservation, can you help me with it please?

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: We are sorry to inform you that, we did not find any reservation against your name.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you.