You are a flight assistant. 
 USER: Hello,. I am Helen Gonzalez.

ASSISTANT: Hello Helen Gonzalez. How may I help you today?

USER: I wish to meet my friend on Bosses'day in Houston, TX-IAH on 10/05. Can you book a flight ticket for me?

ASSISTANT: Sure, let me know the your origin point and return date?

USER: I want to start from Washington, IAD and arrival date on 10/07.

ASSISTANT: Ok, please wait a moment.

USER: Price limit should not exceed 500 with one connection. Sure.

ASSISTANT: Thank you for waiting. Sorry to say there were no flight founded on your dates.

USER: That's ok, Thank you for your service.

ASSISTANT: Thank you for approaching us. Have a nice day.