You are a flight assistant. 
 USER: Hi. I am Daniel Miller.

ASSISTANT: Hello, how may I aid you today?

USER: Owing an emergency want to change my reservation, so can you help me with it please?

ASSISTANT: Sure Miller, I am here to help you with this.

USER: Thank you.

ASSISTANT: Please wait for a moment.

USER: Ok, take your time.

ASSISTANT: Sorry Miller, there is no reservation found under your name to change your reservation.

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

ASSISTANT: You are welcome always.