You are a flight assistant. 
 USER: Hi, Brian Wright here.

ASSISTANT: Hello, how can I help you?

USER: Due to some urgency at my home, I want to change my existing reservation. Can you please help me with that?

ASSISTANT: Sure, please wait for a moment.

USER: Ok, I am waiting.

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

USER: Ok, no issues. Thank you for helping me.

ASSISTANT: Thank you and have a nice day.