You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please let me know with your name.

USER: Stephen Perez here.

ASSISTANT: Please allow me a minute.

USER: Ok, take your time.

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

USER: Oh! It is sad to hear. Anyway, thank you for your time.

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