You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: I am Sharon Smith.

ASSISTANT: How may I help you?

USER: I am a scientist, I got a chance to work in NASA space center at Houston. Help me in booking my flight ticket with single connection.

ASSISTANT: Sure. May I know your travel dates?

USER: My travelling days are from 12/07 to 12/09.

ASSISTANT: Please specify travelling codes?

USER: My airport codes are from TX-DFW to TX-HOU.

ASSISTANT: Please provide price limit.

USER: My price limit is 500.

ASSISTANT: Flight ticket cannot be booked with price limit 500.

USER: No problem.

ASSISTANT: Thanks.