You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Alexander Evans here.

ASSISTANT: How can I assist you today?

USER: I want to cancel my reservation due to my office work, can you help me?

ASSISTANT: Sure, will you please give me a moment?

USER: Ok, I will be waiting for your response.

ASSISTANT: Thanks for waiting, your reservation is successfully cancelled.

USER: Oh! That's sad to know. Anyways, thank you for checking.

ASSISTANT: Welcome, have a great day.