You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: David Allen here.

ASSISTANT: How can I help you?

USER: Can you please help me in cancelling my recent reservation? As my planned trip has been cancelled.

ASSISTANT: Sure, I will help you.

USER: Thanks for that.

ASSISTANT: Sorry, there are no reservation found on your name.

USER: Oh! That's ok, thank you for giving the information.

ASSISTANT: Thank you for choosing us.