You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Due to some entrepreneurship meeting, I am going to change my existing reservation. Can you help me?

ASSISTANT: Sure, I am here to help you. Please share your name.

USER: Barbara Moore here.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry  no reservation found on your name.

USER: No problem, Thanks for the information.

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