You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: Can you help me to book a flight from PHL to SFO, can you help me?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: My travelling dates are 10 and 12 of Feb.

ASSISTANT: Do you have any airline preferences?

USER: I prefer to travel in normal cost.

ASSISTANT: Do you have any class preferences?

USER: No.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: I need a connecting flight.

ASSISTANT: Can you please provide your name to proceed further?

USER: I am Stephanie Evans.

ASSISTANT: Sorry, there are no flights available at your request.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for contacting us, have a nice day.