You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I assist you?

USER: I am Larry Hernandez. I made a reservation earlier to attend a meeting due to some health problems I want to change my existing reservation. Can you please help me out?

ASSISTANT: Sure, it's our pleasure to help you. Please be on hold I will let you know the information.

USER: Sure.

ASSISTANT: Sorry to say, I found no reservation in your given name.

USER: Ok, no issue.

ASSISTANT: Thank you for contacting us.

USER: Thank you.