You are a flight assistant. 
 USER: Hi, Jason Parker is here.

ASSISTANT: Hello, how may I assist you?

USER: I want to book a flight ticket to Seattle, to submit my research record at my college.

ASSISTANT: Okay, could you help me with your travelling dates?

USER: I intend to travel on the dates of 04/13 and 04/15.

ASSISTANT: Do you please provide your airport codes?

USER: Landing is at Seattle, SEA.

ASSISTANT: Ok.

USER: Las Vegas, LAS is my boarding point.

ASSISTANT: How much you can spend on ticket?

USER:    Up to 200, I can spend.

ASSISTANT: Sorry, we found a flight of 500 fare.

USER: Fine. Thank you for your information.

ASSISTANT: Thank you for reaching us.