You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I want to cancel my recent reservation due to postpone of my document verification. Can you help me with that?

ASSISTANT: Please provide your name.

USER: Barbara Baker here.

ASSISTANT: Sorry, no reservation found by your name.

USER: That's ok, no problem.

ASSISTANT: Thanks.

USER: Thank you for your service.