You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you at this moment?

USER: Due to some issues in my destination. Can you modify my reservation details please?

ASSISTANT: Sure, may I know the name on which the ticket has been booked?

USER: Myself Samantha Walker.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry Walker, there is no ticket is existing on your name.

USER: That's ok, no problem. Thank you for your help.

ASSISTANT: Thank you for checking.

USER: Welcome.