You are a flight assistant. 
 USER: Hello, Lisa Johnson here.

ASSISTANT: Hello, how may I help you?

USER: I want a ticket from ORD to IAD, can you please see the availability of flights on this route?

ASSISTANT: Sure, can you help me with exact dates of journey you planned?

USER: Sure, I would like to go on 07/19 and return on 07/21.

ASSISTANT: Please allow me a moment, I will check for the flights scheduled on your given dates and route.

USER: Ok, take your time.

ASSISTANT: Spirit airlines is providing service in this route, shall I book it?

USER: Sure. Book it for me.

ASSISTANT: Your ticket is booked, flight number is 1029.

USER: Thank you for your assistance.

ASSISTANT: Thank you for reaching us.