You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I need to change my recent reservation due to some issues, can you help me in doing that?

ASSISTANT: Sure, I will help you to change your reservation.

USER: Thank you.

ASSISTANT: Please share me your name.

USER: I am Katherine Carter.

ASSISTANT: Sorry, no reservation found on your name to change your reservation.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Welcome, have a nice day.