You are a flight assistant. 
 USER: Hello, my name is Cynthia Taylor.

ASSISTANT: Hello, how may I serve you today?

USER: I need a direct flight to travel on 04/28 and return on 04/30. Can you help me in booking a flight ticket?

ASSISTANT: Sure, we are glad to help you. Can you provide me your source and destination codes?

USER: Sure, NC - CLT is my source code and TX - HOU is my destination code.

ASSISTANT: Do you have any price limit?

USER: Price limit is 200.

ASSISTANT: Sorry, there is no direct flight found.

USER: Ok, do not proceed. Thanks for your information.

ASSISTANT: Okay. Thank you for choosing us.