You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: I need a direct flight to travel, can you please help me to reserve my ticket from DCA to CLT?

ASSISTANT: Sure, may I know your travel dates?

USER: Sure, my preferable dates of journey are from Dec, 23 to Dec, 25.

ASSISTANT: Do you have any specifications?

USER: Not required.

ASSISTANT: Ok, please wait a minute.

USER: Sure, I will wait.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Ok, not an issue.

ASSISTANT: May I know your name?

USER: Sure, my name is Gregory Allen.

ASSISTANT: Thank you for opting us.

USER: Anyways, thank you for your service.