You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you today?

USER: Can you please help me in changing my reservation as my trip got cancelled?

ASSISTANT: Sure, I'll help you with this.

USER: Thank you.

ASSISTANT: Please wait a moment I'll check the reservation list.

USER: Sure.

ASSISTANT: Can I know your name please?

USER: Lisa Allen here.

ASSISTANT: Thank you for sharing your name, there is no reservation found by this name.

USER: Ok, no problem. Thank you for checking out.

ASSISTANT: Thank you for choosing us.