You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Due to an important work in my office, my manager did not approved my leave to travel to Los Angeles. So, I need some help in my flight ticket changing process. Can you please help me in that one?

ASSISTANT: Sure, we will help you.

USER: Thank you so much.

ASSISTANT: Can I know your good name?

USER: I am Barbara Moore and you can check with this name.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say that there is no reservation found on your name.

USER: Not a problem with that one, thank you for your help.

ASSISTANT: Thank you for reaching us, hope to serve you again.

USER: Welcome.