You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you?

USER: I want to change my reservation can you help me with that.

ASSISTANT: Sure, may I know your name?

USER: Brian Thompson here.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry Brian Thompson, no reservation is available by your name.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for choosing us.