You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help 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 name please?

USER: My name is Ruth Gonzalez.

ASSISTANT: Wait for a moment please.

USER: Ok, I will wait.

ASSISTANT: Thanks for waiting.

USER: My pleasure.

ASSISTANT: Sorry to inform you that I have not found your flight reservation to change it.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you.