You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

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

ASSISTANT: Sure, may I know your good name?

USER: My name is Benjamin Clark.

ASSISTANT: Please wait for a while.

USER: Ok, I will wait.

ASSISTANT: Sorry, there is no reservation found on your given name in our data.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us.