You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Can you reserve me a ticket from HOU to DFW?

ASSISTANT: Sure, could you please mention with your dates of journey?

USER: My trip dates are July 18 to 20.

ASSISTANT: Do you have any other specifications please?

USER: Please ensure that my return time is in afternoon.

ASSISTANT: May I know your name please?

USER: James Garcia here.

ASSISTANT: Please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry James, there is no flight found as per your travelling details.

USER: Ok, no issues. Thank you for information.

ASSISTANT: You are welcome.