You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you at this moment?

USER: I am Christopher Roberts. Can you book a ticket from IAH to ORD?

ASSISTANT: Sure, can you please mention your preferable travel dates for booking flight ticket?

USER: Sure, my journey dates are from 05/28 and 05/30.

ASSISTANT: Just give me a moment, I will check flight availability in this route.

USER: Sure, take your time.

ASSISTANT: According to your information, I have found a flight with single stop over in your journey with a minimum fare of 100 is provided by Spirit airlines. Shall I book this flight ticket for you?

USER: Yes, you can.

ASSISTANT: I have confirmed your flight ticket, flight number is 1004.

USER: Thanks for your help and service.

ASSISTANT: You are welcome Christopher Roberts.