You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I assist you today?

USER: I am David Hernandez.

ASSISTANT: Hello, how may I aid you today?

USER: I want to cancel my recent reservation due to some health issues. Can you please help me?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Thank you for your time, sorry, no reservation found with provided name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for availing us.