You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I be of your help?

USER: I want to book a flight ticket with the range of 500 to attend a seminar which  is going to held at TX-IAH.

ASSISTANT: Where do you want to travel from?

USER: My source is IL-ORD.

ASSISTANT: Do you have any connection restrictions?

USER: I need a connecting flight.

ASSISTANT: Please mention dates of your journey.

USER: 03/10 and 10/12 are my preferable travelling dates on which I need to travel .

ASSISTANT: Ok, provide your good name for further proceedings please.

USER: I am Donna Nelson.

ASSISTANT: Ok, please wait a minute. Let me check and revert you.

USER: Ok.

ASSISTANT: Thank you for waiting. We found a Spirit airline with flight number 1000 and price is 200 according to your details.

USER: You can proceed booking with this airline.

ASSISTANT: Your booking is done.

USER: Thank you for your support.

ASSISTANT: Thank you for consulting us.