You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you at this moment?

USER: Can you help me to change my reservation?

ASSISTANT: Sure, we are here to help you. May I know your name please?

USER: Sure, my name is Kevin Taylor.

ASSISTANT: Ok, please be on hold for some time.

USER: Sure.

ASSISTANT: Sorry, we did not find any reservation on your name.

USER: No issues, thank you for your time.

ASSISTANT: Thank you for choosing us.