You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Raymond Hernandez. I want to book a ticket from SEA to DFW to meet my uncle, can you help me in booking?

ASSISTANT: Sure, may I know your trip dates?

USER: I am departing on 10/21 and return on 10/23.

ASSISTANT: Sorry, there is no flight on your requested dates.

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

ASSISTANT: Thank you for reaching us.