You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I want to change my reservation today, can you please help me?

ASSISTANT: Sure, can I know your name please?

USER: My name is Donna Rodriguez.

ASSISTANT: Sorry Donna, there is no reservation found on your name.

USER: Ok, no issues with it. Thank you for checking.

ASSISTANT: Thank you for approaching us.

USER: Most welcome.