You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am planning to visit Philadelphia, will you help me in booking the flight ticket form IAD to PHL?

ASSISTANT: Sure, may I know your travel dates?

USER: My travelling dates are Oct 15 and Oct 17.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight.

ASSISTANT: Ok, please wait  a minute.

USER: Make sure my class must be economy.

ASSISTANT: We found an airline UA with flight 1023 having a fare 100 with single connection. Shall I proceed with booking for economy class?

USER: You can proceed booking with the name David Lee.

ASSISTANT: Ok, your booking has been processed.

USER: Thank you for helping me.

ASSISTANT: Thank you.