You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: Due to some urgent entrepreneurship meeting, I am willing to change my existing reservation. Can you please help me for this?

ASSISTANT: Sure, I'll help you in changing an existing reservation. May I know your name to trace your details?

USER: Thank you very much for quick access, myself Kathleen White.

ASSISTANT: Ok, please wait a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, there is no active reservation have been found under your name in our database to change it.

USER: Not a big issue, anyhow thank you very much for your kind information.

ASSISTANT: Thank you for availing us.