You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Donald Miller.

ASSISTANT: How can I help you?

USER: I want to cancel my flight ticket. Can you please help me with that?

ASSISTANT: Sure, I'll help you in that.

USER: Thanks.

ASSISTANT: Please be on hold.

USER: Ok.

ASSISTANT: There is no reservation found under your name to do cancellation.

USER: Oh! It's ok no problem. Thank you for your service.

ASSISTANT: Thank you for choosing our service.