You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: My name is Ashley Walker and I want to change my reservation. Can you please help me?

ASSISTANT: Sure. Please wait a while.

USER: Ok, take your time.

ASSISTANT:  Thank you for waiting, but I am sorry to say that, there is no active reservation found with your name in our database to change it.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.