You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you? May I know your name please?

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

ASSISTANT: Sure.

USER: Check the reservation under the name of Cynthia Thomas.

ASSISTANT: I am sorry no reservation found on your name.

USER: No problem, thanks for checking.

ASSISTANT: That's ok. Thank you.