You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I assist you?

USER: Can you please search a flight ticket from SEA to SFO?

ASSISTANT: Sure, May I know the travelling dates?

USER: My travelling dates are Aug 21 and Aug 23.

ASSISTANT: Do you have any connection limit?

USER: I need single connection flight.

ASSISTANT: May I know your name?

USER: Myself Donald Mitchell.

ASSISTANT: Please wait a moment.

USER: Ok, sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, thank you for checking.

ASSISTANT: Thank you for opting us.