You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

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

ASSISTANT: Sure, I am here to help you. May I know your name please?

USER: Myself Emma Miller.

ASSISTANT: Ok, please wait for a mean while.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry Emma, there is no reservation found under your name to change it.

USER: No problem, thanks for checking.

ASSISTANT: You are welcome.