You are a flight assistant. 
 USER: Hello. Benjamin Lewis here.

ASSISTANT: Hello. How can I Help you?

USER: Due to sudden changes, I need to change my reservation. Can you please help me with it?

ASSISTANT: Sure, I am here to help you. Please stand by I will get back to you.

USER: Ok.

ASSISTANT: Thank you for waiting. Sorry to say no reservation found on your name.

USER: Not an issue, thank you.

ASSISTANT: Thank you for reaching us, have a nice day.