You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to change my existing reservation, due to bad weather conditions. Can you please help me to change my existing reservation?

ASSISTANT: Please may I know your name?

USER: Sure, myself Stephen Thompson.

ASSISTANT: Please wait a while.

USER: Ok, sure. I will wait for your response.

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

USER: Ok, not an issue. Anyways, thanks for giving the information.

ASSISTANT: Thank you for opting us.