You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I am Patrick Lewis.

ASSISTANT: Ok.

USER: Can you help me in booking from DEN to SFO, as there is a sports meet to attend?

ASSISTANT: Sure, we are here to help you.

USER: Ok.

ASSISTANT: May I know your travelling dates?

USER: My journey dates are Oct 9 to Oct 11.

ASSISTANT: Do you have any preferences?

USER: No.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to inform you, currently no flights are running at that locations due to abnormal weather conditions.

USER: No issue, thank you.

ASSISTANT: Thank you for choosing us.