You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: Sure, please wait a minute.

USER: Sure, check the reservation in the name of Stephen Moore.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: No problem, thanks for checking.

ASSISTANT: Most welcome.