You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Scott Collins. I want to book a flight ticket from Houston to New York to visit Ellis Island. Could you help me in booking a flight ticket with a price limit of 1000?

ASSISTANT: Sure, please provide your travelling dates.

USER: I would like to fly on 12/29 and return date on 12/31.

ASSISTANT: Will you provide your airport codes that you want to travel?

USER: My source from TX - IAH and destination to NY - LGA.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: There is no flights found under your details.

USER: Not an issue. Thanks for your response.

ASSISTANT: Welcome, have a great day.