You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, welcome to flight booking agency. How can I assist you today?

USER: I am Dennis Walker. My music concert is cancelled. So, can you cancel my ticket?

ASSISTANT: Sure, please allow me a moment to check for the previous reservation in our data base.

USER: Sure.

ASSISTANT: I appreciate your patience. Dennis, there is no reservation found under your name.

USER: It's ok. Anyway, thank you for your help.

ASSISTANT: You are welcome. Thank you for contacting us.