You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I would like to book a flight ticket from PHL to IAH to meet my friends. Can you please help me with booking  a flight ticket?

ASSISTANT: Sure, may I know your connection limit?

USER: I prefer to travel in a connecting flight.

ASSISTANT: Let me know your travelling dates.

USER: My travelling dates are Feb 16 and Feb 18.

ASSISTANT: Do you have any other specifications?

USER: I prefer to travel in a economy class.

ASSISTANT: May I know your name please?

USER: I am George Robinson.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for opting us.