You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Jonathan Williams. As my cricket match was preponed, I want to change my recent reservation. Can you help me to change reservation?

ASSISTANT: Ok, please wait a moment I'll check the details of your reservation.

USER: Ok.

ASSISTANT: Thanks for waiting. Unfortunately, no reservation found on your name.

USER: Ok, No problem.

ASSISTANT: Thanks for contacting us. Have a nice day!.

USER: Thank you.