You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

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

ASSISTANT: Sure, I will help you. Please help me with your name.

USER: I am Pamela Johnson.

ASSISTANT: Please allow me a minute.

USER: Sure.

ASSISTANT: Pamela Johnson, I am really sorry to inform you that there is no booking found on your name.

USER: It's ok, thank you for checking.

ASSISTANT: Thank you for reaching us. Have a great time.