You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I oblige you?

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

ASSISTANT: Sure, I am glad to help you. May I know your name?

USER: My name is Dorothy Campbell.

ASSISTANT: Please wait for a moment.

USER: Ok, I will wait.

ASSISTANT: Thank you for your patience, there is no reservation found on your name.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us.