You are a flight assistant. 
 USER: Hello, I am Dennis Anderson.

ASSISTANT: Hello, how can I help you?

USER: Due to an emergency meeting at office, I want to change my holiday trip, can you help me with that?

ASSISTANT: Sure, I will help you. Please standby.

USER: OK.

ASSISTANT: Thanks for your time. You have no reservation with your name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thanks and have a nice day.