You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My name is Robert Anderson.

ASSISTANT: Ok.

USER: Due to a sudden meeting, my friends trip got cancelled. Could you help me in changing the reservation?

ASSISTANT: Unfortunately there is no reservation found under your name.

USER: That's ok. Thank you for your time.

ASSISTANT: Welcome, have a great day.