You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I need your help in changing my reservation, can you please help me?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please help me with the name on which the booking is done.

USER: My name is Jennifer Hernandez.

ASSISTANT: Please allow me a minute.

USER: Sure.

ASSISTANT: Jennifer Hernandez, I am really sorry to inform you that there is no booking done on your name.

USER: That's fine, thank you for checking.

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