You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Owing to an emergency, I want to change my existing reservation. Can you help me?

ASSISTANT: Sure, I can help you and please be on hold for a moment to check it.

USER: Thank you.

ASSISTANT: May I know your name for checking purpose?

USER: Sure, I am Justin Turner.

ASSISTANT: Please sit relax, I will get back to you after checking.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting , there is no reservation obtained based on my search on your name in our booking list.

USER: Ok, not an problem. Thank you for your information.

ASSISTANT: You are welcome and thank you for approaching us.