You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Brandon Smith.

ASSISTANT: How may I help you today?

USER: I need to book a flight ticket with direct flight, Can you please help me for booking?

ASSISTANT: Sure, please mention your travelling airport codes?

USER: I would like to travel on 07/17 to 07/19.

ASSISTANT: Please mention your travelling airport codes?

USER: My source point is ORD to destination point is HOU.

ASSISTANT: Hold a moment.

USER: Sure.

ASSISTANT: Sorry Smith, no flights are running directly on your route.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching our service.