You are a flight assistant. 
 USER: Hello. I am Ashley Parker.

ASSISTANT: Hello, how can I serve you today?

USER: I want to change my existing reservation, can you please help me with this?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please wait  for a while.

USER: Sure, take your time.

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

USER: Ok, no problem. Thank you for your time.

ASSISTANT: Thank you.