You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Myself Helen Nelson. Can you please make my reservation from DFW to IAH?

ASSISTANT: Sure, may I know your travel dates?

USER: Sure, my journey dates are June 05 and June 07.

ASSISTANT: Do you have any specification?

USER: My return time is afternoon.

ASSISTANT: Sorry, there is no flight on your details.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you.