You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in booking my flight ticket from PHL to SFO?

ASSISTANT: Sure, when do you want to travel?

USER: My trip dates will be Feb 26th and Feb 28th.

ASSISTANT: Ok, Do you have any class preference?

USER: I am ok, with any class.

ASSISTANT: Ok, May I know your connection limit?

USER: I need a connection flight.

ASSISTANT: Please mention your name.

USER: I am Patrick Lee.

ASSISTANT: Do you have any other preferences?

USER: I prefer a depart time will be in the evening.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thank you for your patience, No flights were found with your given requirements.

USER: Its ok, thank you.

ASSISTANT: Thank you for availing us.