You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I want to change my reservation due to health problem, can you help me?

ASSISTANT: Sure, I will help you. On whose name did you reserved the ticket?

USER: Please check in the name of Ruth Moore.

ASSISTANT: Sorry to say, there is no reservation on your name in our database.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for opting us, have a nice day.