You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

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

ASSISTANT: Sure, I am here to help you with that.

USER: Thanks.

ASSISTANT: May I know your name?

USER: My name is Ashley Perez.

ASSISTANT: Ok, wait for a minute.

USER: Ok.

ASSISTANT: Sorry to say that, there is no reservation found on your name in our database.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for approaching us.