You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Mary Nelson. I want to attend an event in San Francisco. Can you book a ticket from SEA to SFO?

ASSISTANT: Sure, can you please share your travel dates?

USER: I want to travel on 12/14 and 12/16.

ASSISTANT: Let me check for the availability of flight.

USER: Ok, take your time.

ASSISTANT: Mary, there is no flight available at your requested dates.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for reaching us.