You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Brenda Brown.

ASSISTANT: Can you please let me know how may I help you?

USER: Sure, I need to change my flight ticket booking. Can you help me in that one?

ASSISTANT: Sure, I will help you in changing the ticket details once I have found your past ticket.

USER: Thank you for your positive response.

ASSISTANT: Ok, please be on hold for a minute.

USER: Sure, I don't mind for waiting.

ASSISTANT: Sorry for the trouble which is caused to you, there is no active reservation found with your name to modify the details.

USER: Ok, that's fine. I think it is not booked properly, now I got some clarity about my ticket. Thank you so much for your help.

ASSISTANT: It's my pleasure to help you, thank you for consulting us.

USER: Welcome.