You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know your concern?

USER: Dennis Hernandez here. I would like to visit Seattle, can you help me to book a flight ticket from HOU To SEA?

ASSISTANT: Ok, please let me know the dates of your journey as I need to enter the details in the portal?

USER: I would like to travel on 02/22 and 02/24.

ASSISTANT: Sorry, there are no flights availability at the source airport.

USER: That's ok, I will choose another service to reach my destination.

ASSISTANT: Thank you for connecting with our agency.