You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: I am William Hill.

ASSISTANT: How may I assist you?

USER: I want to cancel my reservation due to my brother coming to home after a 2 years. Can you assist me in this?

ASSISTANT: Sure, I will help you.

USER: Ok, thank you.

ASSISTANT: Sorry, I found no reservation in your given name.

USER: Ok, may be I have done it with some other agency.

ASSISTANT: Thank you for reaching us.

USER: Thank you for the information.