You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Samuel Green.

ASSISTANT: How may I assist you?

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

ASSISTANT: Yes, give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for contacting us.