You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My name is Jeffrey Brown. Due to bad weather conditions, I would like to change my existing reservation. Can you help me?

ASSISTANT: Sure, please wait a moment I will check your reservation status.

USER: Ok, take your time.

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

USER: Its ok, no issues. Thank you for the information.

ASSISTANT: Thank you for choosing us, have a nice day.

USER: Welcome.