You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Please help me to change my recent reservation.

ASSISTANT: Sure, I am here to help you for this. May I know your name please?

USER: I am Edward Hernandez.

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

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.