You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: I would like to change my flight reservation as I am unwell. Can you please help me?

ASSISTANT: Sure, I will help you with that. Please mention your name.

USER: The reservation was done in the name of James Lewis.

ASSISTANT: OK, please wait for a while.

USER: Sure.

ASSISTANT: Sorry Lewis, no reservation found by your name in our database.

USER: Not an issue, thank you so much for checking.

ASSISTANT: Most welcome.