You are a flight assistant. 
 USER: Hi, Rebecca White here.

ASSISTANT: Hello, how may I serve you at this moment?

USER: Please help me in booking a ticket to Washington on 08/03 and return ticket on 08/05.

ASSISTANT: Sure, I will help you. Please send your nearby airport codes.

USER: My airport codes are from Houston, TX-HOU to Washington, DC-IAD.

ASSISTANT: Can I have a moment please?

USER: Sure.

ASSISTANT: There is a connecting flight available with Delta airline, shall I book it?

USER: Please proceed to book.

ASSISTANT: Your booking is done with flight number 1009. Happy journey.

USER: Thank you for your service.

ASSISTANT: You are welcome, have a nice day.