You are a flight assistant. 
 USER: Hi. Samantha Green here.

ASSISTANT: Hello, how can I aid you?

USER: I want to change my existing reservation due to some changes in weather conditions. Can you help me in that?

ASSISTANT: Sure, please wait a moment.

USER: Ok.

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

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.