You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Stephanie Jackson here. I need to change my existing reservation, which is done recently. Can you please help me out?

ASSISTANT: Sure, I can help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry Jackson, there is no active reservation found with your name in our records.

USER: Not a big problem, anyway, thank you for the information.

ASSISTANT: Most welcome.

USER: Thank you for searching.