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

ASSISTANT: Hello. How can I help you?

USER: Due to sudden changes, my meeting has been postponed. I want to change my reservation. Can you please help me with it?

ASSISTANT:  Ok, please wait.

USER: Ok.

ASSISTANT: Sorry, no reservation found on your name.

USER: No problem, thank you.

ASSISTANT:  Thank you for availing us.