You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Brandon Lee here.

ASSISTANT: How may I help you?

USER: Can you change my flight ticket reservation?

ASSISTANT: Sure, may I know your name to check your details.

USER: Ok, I gave my name please check.

ASSISTANT: Sure, please wait for a moment. Sorry, no reservation found on your name.

USER: That's not a problem.

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

USER: Thank you.