You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you at this time?

USER: I want to book a flight ticket to Houston, help me in booking my flight ticket with a fare of 1000.

ASSISTANT: Sure, I can help you in that.

USER: Thank you.

ASSISTANT: Could you let me know your travelling dates, as planned before?

USER: I have planned to start on 01/26, my return date is on 01/28.

ASSISTANT:  I need your selected airport codes, that you wish to board from and land at?

USER: NY-JFK is my starting point, my return date is on TX-IAH.

ASSISTANT:  May I know your name, to proceed further?

USER: I am Elizabeth Walker.

ASSISTANT: Ok, We could not provide you the flights for your journey, on your travel dates.

USER: Its ok, thank you.

ASSISTANT: Thanks for approaching us.