You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, may I know your name?

USER: Eric Collins here.

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

USER: No issue.

ASSISTANT: Thanks for choosing us.

USER: Thanks for the information.