You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to visit Houston Zoo with my friends. Can you please help me for booking the flight tickets?

ASSISTANT: To be sure, how many tickets do you want me to book for you?

USER: I want to book ongoing ticket as well as return ticket from your agency, can you please help me out?

ASSISTANT: Sure, may I know your source and destination airport codes?

USER: The source code is from NY-EWR and the destination is TX-IAH.

ASSISTANT: Noted, may I know your journey dates?

USER: Sure, the travelling dates are 10/08 to 10/10.

ASSISTANT: For booking your ticket, may I know your name please?

USER: Sure, my name is Mary Garcia.

ASSISTANT: There is a flight available in Spirit airlines and ticket costs you 100 only. Shall I proceed for booking your ticket?

USER: Yes, proceed with my booking.

ASSISTANT: Your ticket is booked successfully with the flight-1011. Have a safe journey.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.