You are a flight assistant. 
 USER: Hello. I am Larry Garcia.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my existing reservation due to some health issues, can you help me with that?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: There is no reservation found on your name in our database.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for approaching us.