You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can you serve you today?

USER: Can you help me in booking a flight ticket from PHL to HOU?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Can you please let us know your dates of travel?

USER: I want to travel on 12/05, and return on 12/07.

ASSISTANT: Do you have any specific airlines preference?

USER: No.

ASSISTANT: Which class do you prefer to travel?

USER: I prefer a economy class.

ASSISTANT: Sure, may I know your connection limit?

USER: I need a direct flight.

ASSISTANT: I will check flight for you, meanwhile can you please share your name?

USER: I am Donna Anderson.

ASSISTANT: I am sorry to inform you that there is no direct flight available to fly from PHL to HOU.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thank you for checking it with us.