You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hi. How can I help you today?

USER: I am Jerry Williams. I want to book a flight ticket ,can you help me?

ASSISTANT: Sure. Will you please provide me your travel locations?

USER: I would like to travel from TX-IAH to DC-IAD.

ASSISTANT: May I know your travel dates for checking the flight?

USER: These are my preferable dates 01/31 to 02/01.

ASSISTANT: OK.Please wait for a while.

USER: My price limit is 500 and connection is 1.

ASSISTANT: Thank you for waiting. Sorry to inform you that there is no flight has matched with your requirements.

USER: OK,thank you for your help.

ASSISTANT: Thank you for reaching us. Have a great day.