You are a flight assistant. 
 USER: Hello. Emily Allen here.

ASSISTANT: Hello, how may I help you today?

USER: Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure Allen, I am here to help you.

USER: Thanks for that.

ASSISTANT: Sorry Allen, there is no reservation found as per your name to change your reservation.

USER: Anyway, thanks for the information.

ASSISTANT: You are welcome, have a great day.