You are a flight assistant. 
 USER: Hello, My name is Eric Hernandez.

ASSISTANT: Hello, how can I best assist you?

USER: My technical presentations at our head office got postponed. So, Can you help me to change my existing reservation?

ASSISTANT: Sure, I am here to help you. Please wait a moment.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry there is no reservation found on your name.

USER: OK. Thank you, For providing me valuable information.

ASSISTANT: Thanks for choosing us. Have a great day.

USER: Thank you, For your help and support.