You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Stephen Mitchell. I want to book a ticket from DEN to SEA to meet my uncle, can you help me in booking?

ASSISTANT: Sure, can I know the travel dates please?

USER: I am departing on 10/19 and return on 10/21.

ASSISTANT: Sorry, there are no flights available on your dates.

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

ASSISTANT: Thank you for approaching us.