You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I need your help to book a flight from SFO to SEA.

ASSISTANT: Sure, may I know the travelling dates?

USER: Sure, I want to depart on Sept 25 and intend to return on Sept 27.

ASSISTANT: Do you have any connection limits?

USER: I need a flight with single stopover.

ASSISTANT: Do you have any other requirements?

USER: I prefer an economy class to travel.

ASSISTANT: May I know your name?

USER: Myself Karen Miller.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, no flights found with your preferable dates.

USER: Ok, not an issue. Thank you for the information.

ASSISTANT: Thank you for opting us.