You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Is this flight booking agency?

ASSISTANT: Yes, it is booking agency.

USER: I want to change my reservation due to heavy rainfall in New York, can you help me?

ASSISTANT: Sure, can I know your name to check the previous reservation on your name?

USER: My name is Karen Hernandez.

ASSISTANT: Ok, give me a moment let me check it with you.

USER: Sure.

ASSISTANT: Sorry Karen, no reservation found on your name.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for reaching us. Most welcome.