You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I have a plan to buy a new house in Houston, can you please help me in booking a flight ticket?

ASSISTANT: Sure, I will help you for booking. Can you please provide me your travelling dates?

USER: Ok, my trip dates are from 09/06 till 09/08.

ASSISTANT: Ok, may I know your airport codes?

USER: I want to fly from DFW to IAH.

ASSISTANT: Ok, give me a moment.

USER: My price limit is 200 only.

ASSISTANT: Sorry, there is no flight is available with the cost under 200.

USER: That's ok, thank you for the help.

ASSISTANT: Ok, may I know your name?

USER: Nicholas Young here.

ASSISTANT: Thank you.