You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Melissa Harris.

ASSISTANT: How May I assist you today?

USER: I am planning to visit Washington, can you please book me a ticket from CLT to DCA?

ASSISTANT: Sure, Can you please share your preferable journey dates?

USER: I am planning to depart on Sept 02 and would like to return on Sept 04.

ASSISTANT: Do you have any specifications?

USER: I prefer direct flight on this route.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: Ok, not  an issue. I will find any alternate for this trip. Thank you for providing information.

ASSISTANT: Thank you for reaching us.