You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I want to change my existing reservation, due to bad weather conditions. Can you please help me to change my reservation?

ASSISTANT: Sure, may I know your name to proceed?

USER: Thank you for the response. My name is Daniel Brown.

ASSISTANT: Please wait for a moment to check.

USER: Ok, sure.

ASSISTANT: Sorry, no reservation found for this search.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for reaching us.