You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am Gary Roberts from Houston. I want to visit Atlanta in this month. Can you please book a flight ticket from IAH to ATL?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: Thank you for your positive response, I want to take off on 01/04 and please confirm my return ticket also on 01/06.

ASSISTANT: Please wait for a moment.

USER: Ok, take your time and find a best flight for me.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: Oh! It's ok no problem, I will contact another airline agency.

ASSISTANT: You are welcome.

USER: Thank you for your information.