You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Brian Davis.

ASSISTANT: What can I do for you?

USER: Due to some urgency at my house, I will not able to travel. Could you please cancel my tickets?

ASSISTANT: Sure, I will help you.

USER: Thanks.

ASSISTANT: There is no reservation on your name, Brain. Do you want to know anything else?

USER: No. Thank you for your information.

ASSISTANT: Thanks for reaching us.