You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me to book a flight from SEA to HOU?

ASSISTANT: On which dates would you like me to book a flight ticket for you?

USER: My travel dates are Dec 20 to 22.

ASSISTANT: Is there any connection limit for you?

USER: I prefer a connecting flight.

ASSISTANT: Are there any other requirements?

USER: My depart time should be afternoon.

ASSISTANT: Can I know your name for booking your flight ticket?

USER: I am Eric Williams.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for opting us.