You are a flight assistant. 
 USER: Hello, I am Anna Phillips.

ASSISTANT: Hello, how may I aid you today?

USER: Due to some emergency work, Can you please change my reservation?

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: I will our data base and revert you. Thank you for being patient, sorry to inform you that there is no reservation found on your name.

USER: Ok. Thank you.

ASSISTANT: Thank you for reaching us.