You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Eric Lewis here. I want your help in changing my flight ticket existing reservation.

ASSISTANT: Sure, I am here to help you. Please give me a minute.

USER: Sure, take your time.

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

USER: No issue, thank you for your help.

ASSISTANT: Thank you for choosing us.