You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Amy Baker.

ASSISTANT: Baker, how may I assist you today?

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

ASSISTANT: Sure, please wait a moment. Let me check?

USER: Sure, I will wait for your response.

ASSISTANT: Sorry Amy Baker, there are no active reservation on your name.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for reaching us.