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

ASSISTANT: Hello, how may I serve you today?

USER: As my schedule of attending an public meeting got postponed. Can you please help me in changing my reservation?

ASSISTANT: Sure, we are glad to serve you. Please hold a moment.

USER: Sure.

ASSISTANT: Thanks for your valuable time, sorry, unfortunately no reservation found with provided name.

USER: Ok, no issue. Thank you for your information.

ASSISTANT: Thank you for connecting with us, have a great day ahead.