You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I want to book a ticket from SFO to DFW. Could you book a ticket?

ASSISTANT: Sure, may I know the travelling dates?

USER: Depart date is Mar, 15 and return by Mar, 17.

ASSISTANT: Do you have any connection limit?

USER: I prefer connecting flight.

ASSISTANT: Is there any other requirements?

USER: I would like to return in the morning.

ASSISTANT: May I know your name?

USER: My name is Sarah Parker.

ASSISTANT: Please wait a minute.

USER: Ok.

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

USER: Thanks.

ASSISTANT: Thank you for opting us.