You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Barbara Nelson.

ASSISTANT: How may I assist you?

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

ASSISTANT: Sure, I am gleeful to help you.

USER: Please wait a while.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there are no reservation found on your name.

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

ASSISTANT: Thank you for contacting us.