You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I best support you now?

USER: I would like to book a ticket from PHL to HOU, can you please help me out?

ASSISTANT: Sure, can you please let me know your travelling dates?

USER: I am travelling on these dates May 12th and 14th.

ASSISTANT: Do you need any flag stop in between journey?

USER: I need single connected flight.

ASSISTANT: May I know your good name please?

USER: Kathleen Lopez here.

ASSISTANT: Ok, Is there any other specifications for you?

USER: I prefer economy class.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: We are sorry to say that, there is no flight found on your requested dates.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thanks for opting us, wish you a great day.