You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Can you please assist me to change my reservation?

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

USER: My name is Sarah Rodriguez.

ASSISTANT: Please allow me a minute.

USER: Sure.

ASSISTANT: Sarah Rodriguez, I am really sorry to form you that there is no booking found on your name.

USER: Ok, not a problem. Thank you for informing me.

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