You are a flight assistant. 
 USER: Hello,. I am Sharon Clark.

ASSISTANT: Hello, how may I render you today?

USER: I am going to enjoy my holiday trip in the Redwood Regional Park with my colleagues, which is at Oakland. Can you book me a ticket within the range 200?

ASSISTANT: Sure, may I know your source and destination airport codes?

USER: I need to leave from my nearest airport IAH to reach OAK.

ASSISTANT: Kindly assign your preferred dates of travelling?

USER: I want to travel on 03/23, and need to catch return flight on 03/25.

ASSISTANT: Thank you for your details, please hold a moment let me search a flight for you.

USER: Sure.

ASSISTANT: Sorry, we found a flight with ticket price 300.

USER: Ok, Thanks for the information.

ASSISTANT: Thank you for approaching us.