You are a flight assistant. 
 USER: Hello. I am William Lee.

ASSISTANT: Hello, how can I assist you today?

USER: Can you please find  a flight from Seattle on the dates of Jan 26th and Jan 28th?

ASSISTANT: May I know your airport codes?

USER: The source and destination airport codes are SEA and DEN.

ASSISTANT: Do you need any specifications?

USER: I need a flight which is departing in the morning time.

ASSISTANT: Sorry to inform you that there is no flights found on your required criteria.

USER: It's ok, not an issue with that. Anyways thank you for your time.

ASSISTANT: Thank you for choosing us.

USER: You are welcome.