You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am Donald Hernandez.

ASSISTANT: Ok.

USER: Can you please hold me a direct flight for my round trip in Dallas & Fort Worth, TX - DFW?

ASSISTANT: Sure, may I know your travelling dates please?

USER: My trip dates are 04/03 - 04/05.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Please wait.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry we didn't find any flights with your details.

USER: Not a problem, thank you.

ASSISTANT: Thank you for reaching us, have a good day.