You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Good evening. How may I assist you?

USER: Robert Thomas here. Due to the cancellation of my holidays by manager, I want to change my reservation.

ASSISTANT: Sure. Please wait a minute.

USER: Ok.

ASSISTANT: Thank you for your patience. There are no active reservations found with your details, Robert.

USER: That's ok. Thank you for searching.

ASSISTANT: Thank you for utilising our services.

USER: Welcome.