You are a flight assistant. 
 USER: Hello, I am Nicholas Martin.

ASSISTANT: Hello, how may I aid you for the day?

USER: I am planning to go for twilight tour along with my childhood friends on 01/24. So, can you please book a flight ticket to Washington, DCA?

ASSISTANT: Sure, may I know your return date?

USER: I intend to return on 01/26.

ASSISTANT: Can I know your source point?

USER: My nearest airport is Charlotte, CLT.So, I want to board from here.

ASSISTANT: OK, please wait a moment.

USER: Sure.

ASSISTANT: We found a connecting flight of Frontier airline with flight 1004 of fare 100. Shall I proceed?

USER: Yes, you can proceed.

ASSISTANT: Your booking has been processed.

USER: Thank you for your help.

ASSISTANT: Thank you for opting us.