You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

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

ASSISTANT: Sure, please be on hold.

USER: Thank you for considering my request and I will wait for your positive response.

ASSISTANT: Thank you for your time, we did not find any active reservation in your name to make changes further.

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

ASSISTANT: Thank you for reaching us.