You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,.

USER: Kathleen Lopez here.

ASSISTANT: How may I help you?

USER: Can you book a connecting flight to Houston for my business trip?

ASSISTANT: Please provide your journey codes.

USER: My travelling dates for journey are 09/13 to 09/15. My price limit is less than 200.

ASSISTANT: Please provide your journey codes.

USER: Sure. My airport codes for boarding the flight are AUS to IAH.

ASSISTANT: There is no flight found.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thanks.