You are a flight assistant. 
 USER: Hello. My name is John Lee.

ASSISTANT: Hello, how can I help you?

USER: I want to change my reservation, can you please help?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found with your given name.

USER: No worries, thank you.

ASSISTANT: Thank you for opting us.