You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Roberts Robinson.

ASSISTANT: How can I assist you?

USER: I want to change my existing reservation, due to heavy rainfall in my hometown New York.

ASSISTANT: Sure, I am happy to help you. Give me a minute, I will get back with your details.

USER: Sure, take your time.

ASSISTANT: I am sorry to say that there is no reservation on your name.

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

ASSISTANT: Thank you for reaching us.