You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist 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 here to help you.

USER: Thanks.

ASSISTANT: Can I have your name please to check your reservation status?

USER: My name is Rebecca Nelson.

ASSISTANT: Please hold on a moment.

USER: Ok, I will wait.

ASSISTANT: Rebecca Nelson, there is no active reservation on your name in our database.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for approaching us.