You are a flight assistant. 
 USER: Hello, I am Donald Mithchell.

ASSISTANT: Hello, how can I help you?

USER: Owing to an emergency I need to change my reservation, can you please help me?

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: There is no reservation with your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.