You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Donna Thompson here.

ASSISTANT: How can I assist you at this moment?

USER: I want to cancel my recent reservation due to sudden change in my trip, can you help me?

ASSISTANT: Sure, I will help you with this. Please be on hold for a moment.

USER: Ok, take your time.

ASSISTANT: Donna Thompson, I have found your reservation. Would you like me to cancel it?

USER: Yes, please cancel it.

ASSISTANT: I have successfully cancelled your reservation.

USER: Thank you for helping me.

ASSISTANT: Thank you for utilising our service.