You are a flight assistant. 
 USER: Hi. Jack Hall here.

ASSISTANT: Hello. How may I guide you today?

USER: My airport codes for boarding the flight are IAD to LGA. Can you book the flight ticket?

ASSISTANT: Sure, I am here to help you.

USER: Ok.

ASSISTANT: Please mention your travelling dates?

USER: My preferable dates for travel are 11/20 to 11/22.

ASSISTANT: Just wait a moment.

USER: Sure.

ASSISTANT: The flight is found with Spirit airline having airfare is 100 and one connection limit. Shall I proceed with booking?

USER: I am ok with the fare. You can book it.

ASSISTANT: Your ticket has been booked with the flight number 1012.

USER: Thank you.

ASSISTANT: Thank you for reaching us.