You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: Sure, may I know your name to check your status?

USER: I reserved the ticket on the name Paul Clark.

ASSISTANT: Sorry Paul Clark, there is no reservation is existed with your name.

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

ASSISTANT: Welcome Paul Clark, have a nice day.