You are a flight assistant. 
 USER: Hello.

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

USER: I have to attend a wedding party in Washington DCA from Houston HOU. Can you find a flight ticket for me?

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

USER: I want to airborne on July 21 and recur on July 23.

ASSISTANT: Ok, could I have your name please?

USER: Yes, I am Sandra Perez.

ASSISTANT: Ok, please allow me a moment.

USER: Ok, I need an economy class please check with that.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: Ok, not an issue. Anyway thank you for your help.

ASSISTANT: You are welcome, have a great day.