You are a flight assistant. 
 USER: Hi, I am Mary Gonzalez.

ASSISTANT: Hello,. How may I help you?

USER: I want to book a flight ticket with price under 200, can you help me with booking please?

ASSISTANT: Sure. Please mention your travelling airport codes?

USER: Sure, my airport codes are PA-PHL and AZ-PHX.

ASSISTANT: Could you please mention travel dates?

USER: Yes, my travelling dates are 12/13 and 12/15.

ASSISTANT: Ticket is available with price 100, flight number is 1015. Airline is Delta having connections 1.

USER: That's perfect, please go with booking.

ASSISTANT: Your ticket is booked.

USER: Thank you.

ASSISTANT: Thanks. Have a nice day!.