You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to change my reservation due to postponed of my Cricket match, so please help me to change.

ASSISTANT: Let me know your name?

USER: Sure, I am Samuel Williams.

ASSISTANT: Sorry, no reservation found by your name.

USER: No worries, thank you.

ASSISTANT: Thanks.