You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Stephen Nelson, want a flight from Las Vegas, LAS. Will you help me to book a flight with a fare of 200?

ASSISTANT: Sure, may I know your travel dates?

USER: 10/29-10/31 are my travelling dates to travel, to meet my family doctor.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: May I know your destination airport code please?

USER: It's Minneapolis, MSP.

ASSISTANT: There is no flight on your details.

USER: Ok. I will go for other source. Thank you.

ASSISTANT: Thank you so much.