You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve 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 please?

USER: My name is Patrick Wilson.

ASSISTANT: Wait a while.

USER: Sure, take your time.

ASSISTANT: Thank you for being waiting, we do not found any active reservation in your name to make changes further.

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

ASSISTANT: Thank you for opting us. Hope to serve you better next time.