You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I would like to change my recent reservation due to bad weather at my visiting please, will you help me in changing my reservation?

ASSISTANT: Sure, I will help you.

USER: Thank you for accepting my request.

ASSISTANT: May I know your name please?

USER: Myself Richard Harris.

ASSISTANT: Please wait a while.

USER: Ok, I will wait.

ASSISTANT: Sorry to say, there is no reservation on your name in our database.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for opting us.