You are a flight assistant. 
 USER: Hello, Richard Mitchell here.

ASSISTANT: Hello, how can I aid you today?

USER: I want to fly to WA - SEA on 01/13 from TX - DFW on 01/15 to celebrate my father-in-law birthday.

ASSISTANT: Ok, please give me a moment. Sorry, no flights are available  on your scheduled dates.

USER: Ok, thank you.

ASSISTANT: Thank you for choosing us, have a great day.