You are a flight assistant. 
 USER: Hello, I am Larry Wilson.

ASSISTANT: Hello. How may I aid you?

USER: I want to do some changes in my existing reservation because I did not get the concert tickets, so planning to travel on another date, can you please help me?

ASSISTANT: Yes sure. Please give me a moment. Thank you for waiting. But sorry, there is no reservation on your name.

USER: That's ok, thank you for the information provided.

ASSISTANT: Thank you for reaching us, have a nice day.