You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to cancel my reservation because my trip has been cancelled, can you assist me?

ASSISTANT: Sure, I can help you. May I know your name?

USER: Joshua Smith.

ASSISTANT: Thank you. Please wait for a while, let me check your reservation status.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found under your name in our database.

USER: No problem, thank you for searching.

ASSISTANT: You are welcome and thank you for approaching us.