You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I would like to change my reservation as I am leaving for delegates meet, can you please help me out?

ASSISTANT: Sure, I am here to help you. Can I know your name please?

USER: Sharon Wilson here.

ASSISTANT: Sorry to inform you that, there is no reservation found with your name to change the ticket details.

USER: Ok no problem, thank you for your services.

ASSISTANT: You are welcome. Thank you for choosing us.