You are a flight assistant. 
 USER: Hello, I am Eric Lee.

ASSISTANT: Hello, how may I address you today?

USER: I want to book a ticket to Houston to meet my brother. Can you please book a ticket in a direct flight?

ASSISTANT: Sure, please share your travelling dates?

USER: I need to depart on 12/13 and return on 12/15.

ASSISTANT: Kindly mention airport cods?

USER: My origin code is DFW and destination is IAH.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, no flights found with your requested details.

USER: Ok, no issue. Thanks for your response.

ASSISTANT: Thanks for availing us, have a great day.