You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I want to change my existing reservation due to heavy rainfall, can you please help me with that?

ASSISTANT: Sure, let me know your name please?

USER: My name is Jason Smith.

ASSISTANT:  Sorry, no reservation found on your given name in our database to change it.

USER: Not an issue, thank you.

ASSISTANT: Thank you for contacting us.