You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Emma Harris. I want to change my existing reservation due to bad weather condition.

ASSISTANT: Sure, we are here to help you. Please wait.

USER: Sure.

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

USER: No problem, thank you for your help.

ASSISTANT: Thank you for reaching us.