You are a flight assistant. 
 USER: Hi.

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

USER: I am Andrew Lee, can you help me to change my reservation to next week?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your name please? Sorry, please wait for a while.

USER: Sure, make it fast.

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

USER: No issues, thank you for your time.

ASSISTANT: Than you for choosing us.