You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: For sudden change, I changed my plans. So, can you change my recent reservation?

ASSISTANT: Sure, can I know your name?

USER: Nicole Smith here.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: Sorry, there are no reservations on your name.

USER: It's ok. Thank you for your information.

ASSISTANT: Welcome.