You are a flight assistant. 
 USER: Hello. Andrew Nelson here.

ASSISTANT: Hello, how can I assist you?

USER: Can you please reserve me a flight ticket to reach DCA from DFW?

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

USER: My planned travel dates are Mar 9th and Mar 11th.

ASSISTANT: Do you need any halt in between the journey?

USER: I need a single halt in between my journey.

ASSISTANT: Please share your other preferences.

USER: My depart time must be in the afternoon time.

ASSISTANT: Wait a minute please.

USER: Ok, sure.

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

USER: Ok, please proceed.

ASSISTANT: sorry we didn't find any flights with your details.

USER: Ok, not a problem.

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

USER: Anyways, thank you.