You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Samantha Walker here.

ASSISTANT: How can I assist you at this moment?

USER: I want to change my reservation, which is don recently. Can you please help me out?

ASSISTANT: Sure Samantha Walker, I am happy to help you with that. Please wait a moment to check your reservation status.

USER: Sure, I will wait for your information.

ASSISTANT: Sorry Samantha Walker, no reservation has found under your name to change.

USER: Not a problem. anyways thank you for the information.

ASSISTANT: Thank you for choosing us, have a good day.