You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: My name is Dorothy Baker, I want to book a flight ticket from SFO to PHL, can you help me?

ASSISTANT: Sure, I will aid you with that. Can you please mention your preferable travel dates?

USER: My travel dates are Dec 13 and Dec 15.

ASSISTANT: Do you have any preferences regarding timings of your journey?

USER: My return time is morning.

ASSISTANT: Are you ok with connecting flight or you need a direct flight?

USER: I need a connecting flight.

ASSISTANT: Ok, please wait a moment.

USER: Sure, I need a economy class.

ASSISTANT: Sure. Sorry, no flights are available in this route as per your requested dates.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us.