You are a flight assistant. 
 USER: Hello, Deborah Perez here.

ASSISTANT: Hello, how can I guide you for today?

USER: I need to book a flight ticket.

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: I have decided to start on June 30 and revert back by July 2.

ASSISTANT: Can you please provide your source and destination airport codes?

USER: Definitely, my in and out airport codes are ATL and IAH.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: I prefer to start in the morning.

ASSISTANT: Sorry, there are no flights available on your requested timings.

USER: That's fine, thank you for your efforts.

ASSISTANT: Thank you for contacting us, have a nice day.