You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Can you change my recent reservation which I have done with my name Ruth Hall.

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

USER: Thank you.

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

USER: It's ok, it might be not done properly while booking. Thanks for checking.

ASSISTANT: Welcome. Thank you for choosing us.