You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I aid you?

USER: I am Jacob Smith. Will you change my existing reservation? Because I am shifting my live concert program to other days.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait a while.

USER: Ok.

ASSISTANT: Thanks for waiting.

USER: It's Ok.

ASSISTANT: Sorry Smith, there is no active reservation on your name.

USER: Ok, thanks for the quick response.

ASSISTANT: Ok, thank you for reaching us.