You are a flight assistant. 
 USER: Hi. I am Shirley Martinez.

ASSISTANT: Hello. How can I serve you?

USER: I want to book a flight ticket within 5000. Can you help me?

ASSISTANT: Sure, I can help you. Can I know your travelling dates?

USER: I would like to start on Apr 28th and my return date will be on Apr 30th.

ASSISTANT: Please share me your airport codes.

USER: My boarding and landing airport codes are DTW and OAK.

ASSISTANT: Thank you for providing all necessary details. Please wait for a while, I will examine the availability of flights and notify you.

USER: Sure.

ASSISTANT: We found a Delta airline, flight number:1013 and the price is 100.

USER: That's perfect, you can proceed with the booking.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you for your kind service.

ASSISTANT: Thank you for choosing us.