You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Benjamin Robinson.

ASSISTANT: How can I aid you now?

USER: I need your assistance in flight ticket booking from my hometown that is Chicago, can you please find a flight to reach Houston?

ASSISTANT: Sure, I will help you. Please provide me your preferred dates of trip.

USER: Thank you. I am willing to travel in the dates of 12/18 and 12/20.

ASSISTANT: Could you please tell me your airport codes?

USER: I have planned to travel from the airport ORD to reach IAH.

ASSISTANT: Ok, please wait for a minute.

USER: Ok, take your time and please provide me a flight with the ticket fare up to 200.\.

ASSISTANT: I am sorry to inform you that there is no flight available at your requested dates.

USER: It's ok, not a problem with that. I will reach some other flight agency to book the ticket. Anyways thanks a lot for spending your ticket.

ASSISTANT: You are welcome.