You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am John Collins.

ASSISTANT: How may I help you today?

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

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait a moment.

USER: Sure, take your time.

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

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

ASSISTANT: Thanks for reaching us.