You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Katherine Brown here.

ASSISTANT: Nice to meet you.

USER: Can you please aid me in changing my existing reservation?

ASSISTANT: Sure, I can help you in that. Please wait for a while.

USER: Thank you, I will wait.

ASSISTANT: Katherine Brown, there is no active reservation found under your name to do modifications in that.

USER: No issues, thank you for your information.

ASSISTANT: Thank you for choosing us, have a nice day.