You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I need to change my reservation due to urgent meeting, can you help me?

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

USER: I am Ronald Garcia.

ASSISTANT: Please allow me a minute.

USER: Sure.

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

USER: That's ok. Thank you.

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