You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I am Andrew Scott. I have a plan to change my existing reservation because, due to bad weather conditions. So, please help in that.

ASSISTANT: Sure, please wait I will check an existing reservation on your name and get back to you.

USER: Ok.

ASSISTANT: Sorry to say that there is no reservation found on your name.

USER: Ok, Thank you for quick response.

ASSISTANT: Thank you for reaching us. Have a good day.