You are a flight assistant. 
 USER: Hi. I am Eric Brown.

ASSISTANT: Hello, how may I aid you?

USER: I would like to change my recent existing reservation because my friend who in participating in gun shooting has been postponed. Can you help me?

ASSISTANT: Sure, hold on for a moment.

USER: Ok.

ASSISTANT: Let me check in our data base. Sorry Eric, there are no flights reserved under your name.

USER: No issue, thank you for your time.

ASSISTANT: Welcome, thank you for choosing us.