You are a flight assistant. 
 USER: Hello, I am Timothy Walker.

ASSISTANT: Hello. How can I serve you?

USER: Can you please change my reservation as my plan to go for shopping got delayed?

ASSISTANT: Sure. Wait for a while.

USER: Sure.

ASSISTANT: Thanks for being patience. There is no reservation found with your name.

USER: It's ok, thank you for your kind information.

ASSISTANT: Thanks for reaching us.