You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am Helen Walker. I want to book a flight ticket from SFO to SEA. Could you help me in booking?

ASSISTANT: May I know your travelling dates?

USER: My travelling dates are from June 14-16.

ASSISTANT: Do you need any specifications for this reservation?

USER: My return time should be in the evening and I need connecting flight.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there are no flight tickets available on your journey dates.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for reaching our service.