You are a flight assistant. 
 USER: Hi. I am Brian Thompson.

ASSISTANT: Hello, how can I assist you?

USER: Owing an emergency want to change my reservation, so can you please help me out with this?

ASSISTANT: Sure, please wait a moment.

USER: Ok, take your time.

ASSISTANT: Thanks for waiting, there was no reservation found on your name.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for choosing us.