You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you/.

USER: Brian Taylor here. I want to change my existing reservation, can you help me?

ASSISTANT: Sure, give me a minute.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: Ok, no issues with it.

ASSISTANT: Thank you for picking us.

USER: Thank you for checking.