You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Larry Wilson.

ASSISTANT: How can I serve you?

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

ASSISTANT: Sure, We are here to assist you. Please wait a while.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, but I am sorry to say that, there is no active reservation found with your name in our database to change it.

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

ASSISTANT: Thank you for choosing us.