You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I would like to visit Philadelphia, will you help me in booking the flight ticket from BOS to PHL?

ASSISTANT: Sure, help me with the trip dates?

USER: My travelling dates are May 28 and May 30.

ASSISTANT: Do you have any airline preferences?

USER: I always prefer normal-cost airlines.

ASSISTANT: May I know your name please?

USER: Myself Gregory Adams. I need a direct flight in economy class.

ASSISTANT: Thank you for your details, we did not find any flights running in your preferred dates.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.