You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am David Harris.

ASSISTANT: How may I render you today?

USER: I want to attend a workshop in California Academy of Sciences at San Francisco, SFO.

ASSISTANT: Ok.

USER: Can you please help me in reserving a flight ticket?

ASSISTANT: Sure, I will reserve you a seat. What is your origin point?

USER: My origin airport code is Charlotte, NC-CLT.

ASSISTANT: When did you plan to go?

USER: My planned dates are from 09/22 to 09/24.

ASSISTANT: Please mention your price limit.

USER: My price limit is 500.

ASSISTANT: Ok, Thanks for your details. We found a AA airline with flight number 1003. Shall I proceed to book?

USER: Please proceed.

ASSISTANT: Ok. Your reservation is done.

USER: Thank you.

ASSISTANT: Thank you.