You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Due to heavy rain, I want to change my recent reservation. Can you help me?

ASSISTANT: Sure, may I know your good name?

USER: Gary Walker here.

ASSISTANT: Unfortunately there is no reservation found with your name.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you for reaching us.