You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, may I know your good name please?

USER: Sure, I am Karen Walker.

ASSISTANT: How may I help you?

USER: I want to go for a holiday vacation to Houston, TX-HOU from Los Angeles, CA-LAX.

ASSISTANT: OK, let me know your travelling dates?

USER: I need to fly on 04/23 to 04/25 with price limit 200 and a single connection.

ASSISTANT: OK, please wait a moment. let you know information.

USER: OK.

ASSISTANT: Thanks for waiting, sorry to inform that we have no flights found with your requirements.

USER: OK, thank you.

ASSISTANT: Thanks for contacting us.