You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you today?

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

ASSISTANT: Sure, I will help you with that. Please give me a minute.

USER: Sure.

ASSISTANT: May I know your name please?

USER: Myself Joshua Mitchell.

ASSISTANT: I am sorry to say that there is no reservation found under your name.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for reaching us.