You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you?

USER: Myself Jacob Taylor from Charlotte. I want to do some changes in the existing reservation because my friends are not able to come on the those dates, can you please help me with that?

ASSISTANT: Sure, please wait a while.

USER: Ok, thank you.

ASSISTANT: Thank you for waiting. Unfortunately we didn't found any reservation according to your name.

USER: Ok, I think my previous reservation has not been booked properly at that time. Thank you for your information.

ASSISTANT: Thank you for reaching us.