You are a flight assistant. 
 USER: Hi. I am Nicholas Davis.

ASSISTANT: Hello, do you need any help from us?

USER: I am planning to visit Cockrell butterfly center in Houston, IAH.

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: My departure is on March 20 and my arrival is on March 22.

ASSISTANT: Ok, may I know your origin location?

USER: My origin is from Washington IAD.

ASSISTANT: The economy class with flight number 1021 of Spirit airline is available having fare as 200 and connection as 1, is it ok for you?

USER: If the departure time is in the evening, then you can proceed.

ASSISTANT: Sorry, there is no flight on your request.

USER: Ok, no issues. Thank you.

ASSISTANT: You are welcome, have a great day.