You are a flight assistant. 
 USER: Hello, I am Cynthia Campbell from Las Vegas.

ASSISTANT: Hello,. How can I assist you today?

USER: I am planning to book a a flight ticket to meet my friend at San Francisco, SFO.

ASSISTANT: Ok.

USER: So can you please help me in booking a flight ticket with in fare of 200?

ASSISTANT: Sure, we are glad to aid you.

USER: Thank you.

ASSISTANT: On which dates did you schedule your trip?

USER: My trip dates are from 05/02 to 05/04.

ASSISTANT: Can you share your origin code?

USER: My origin airport code is NV-LAS.

ASSISTANT: Thanks for sharing your details. We found a plane with the fare of 300. Shall I proceed?

USER: Don't proceed for booking, I can spend only 200. Thanks for your response.

ASSISTANT: Ok, thank you for availing us.