You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I amend you?

USER: Due to heavy rain, I want to change my reservation? Can you help me?

ASSISTANT: Sure, I will help you. May I know your name please?

USER: Dorothy Mitchell here.

ASSISTANT: Please standby.

USER: Ok.

ASSISTANT: Thank you for your time. Sorry, we could not find any reservation in your name.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you for contacting us. Hope to serve you again.