You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want a ticket.

ASSISTANT: Can I know your airport codes?

USER: It's Chicago ORD to Charlotte CLT.

ASSISTANT: Will you provide me the travel dates?

USER: 03/23 to 03/25.

ASSISTANT: Do you have any other additional requirements?

USER: Fare must be 200 or less than 200 with 1 connection.

ASSISTANT: Can I know your name?

USER: Gary Walker this side.

ASSISTANT: Sorry Walker, there are no flight matching with your requirements.

USER: OK.

ASSISTANT: Thank you.

USER: Thank you.