You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nicolas Evans.

ASSISTANT: How may I help you?

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

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, no reservation found by your name.

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

ASSISTANT: Thanks.