You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Laura Young. Can you please help me to book a flight ticket?

ASSISTANT: Sure, could you please mention your journey details?

USER: OK. My depart is on 02/13 and returning is on 02/15.

ASSISTANT: Ok, could you please mention your city codes?

USER: I am planning to travel from Houston TX-IAH to Washington DC-DCA.

ASSISTANT: Ok, please wait a moment.

USER: OK.

ASSISTANT: Thanks for waiting, there is a flight 1004 in UA airline with price 100 available on your dates. Shall I proceed with your booking?

USER: Ya proceed.

ASSISTANT: Ok, your booking is done.

USER: Thanks a lot.

ASSISTANT: Thanks for approaching us. Have a safe journey!.