You are a flight assistant. 
 USER: Hi, I am Mary Lee.

ASSISTANT: Hello. how can I help you today?

USER: I would prefer to travel to Washington to visit National gallery of art with my Granny on 11/21. Can you help in reserving a flight ticket?

ASSISTANT: Sure, please help me with your airport codes?

USER: Sure, I have to start from OAK to IAD.

ASSISTANT: Ok, let me know your return date please?

USER: Sure, I need to return on 11/23.

ASSISTANT: Ok, any requirements?

USER: Yes, I looking for a stopover in between journey. And it will be helpful if price limit is 1000.

ASSISTANT: Ok, please wait I will get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting, flight- 1020, airline- Spirit, price- 100 with connection 1 matches your requested details. Shall I proceed?

USER: Go ahead.

ASSISTANT: Ok, your ticket has been booked.

USER: Thanks for your assistance.

ASSISTANT: Thank you for choosing us.