You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, please mention your name?

USER: Shirley Allen here.

ASSISTANT: OK, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say, no reservation found with your name.

USER: No problem, Thanks for the information.

ASSISTANT: Thanks for reaching us.