You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I help you?

USER: I am Brian Nelson. I am planning to travel form DFW to SFO, help me in booking a flight ticket?

ASSISTANT: Sure, May I know the journey dates?

USER: My travelling dates are Mar 15 to 17.

ASSISTANT: Do you have any connection limits?

USER: I need 1 connection flight.

ASSISTANT: Do you have any airline preference?

USER: I am comfortable in any airlines.

ASSISTANT: Please help me with your class preference.

USER: I am ok with any class.

ASSISTANT: Please help me with your departure and arrival timings.

USER: I want to depart in afternoon flight.

ASSISTANT: Please wait a moment.

USER: Ok.

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

USER: That's ok, thank you.

ASSISTANT: Thank you for opting us.