You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be at your service.

USER: I want to change my reservation, my client meeting has been postponed. Can you please help me with this?

ASSISTANT: sure, may I know your name to check the data base and revert you?

USER: Sure, I am Amanda Clark.

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

USER: Ok, no worries.

ASSISTANT: Thank you for picking us.

USER: Thank you for your help.