You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Rebecca Carter.

ASSISTANT: By what way may I amend you now?

USER: I am planning to go for Twilight tour along with my parents.So, Can you please book a flight ticket to Washington, DCA?

ASSISTANT: Ok. To book a ticket, may I have your other airport code?

USER: As Philadelphia, PHL is my nearest airport, I want to board from there.

ASSISTANT: Is there any stopover in your journey?

USER: Yes, I need a stopover.

ASSISTANT: What are your travelling dates?

USER: I want to start on 06/03 and return on 06/05.

ASSISTANT: Ok, thanks for sharing your details. We did not find any flights that matches with your information.

USER: It's ok, no problem. Thank you for your kind information.

ASSISTANT: Thank you for opting us.