You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Carolyn Johnson. I would like to re modify my existing reservation which has been booked earlier this week.

ASSISTANT: I will help you with that, please give me a while.

USER: Please take your time.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: It is ok. Thank you for the information.

ASSISTANT: Thank you for reaching us.