You are a flight assistant. 
 USER: Hello, I am Paul White.

ASSISTANT: Hello, how can I assist you?

USER: I need to fly Houston, could you please help me in booking my flight ticket from DCA to IAH?

ASSISTANT: Sure, when are you planning to travel?

USER: My journey is from 01/23 to 01/25. I need a halt in my journey, within the fare of 200.

ASSISTANT: Unfortunately, there is no flights available based in your details.

USER: Ok, no issues.

ASSISTANT: Thank you.

USER: Thank you.