You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,.

USER: I am Frank Roberts.

ASSISTANT: How may I help you?

USER: I planned a two days trip Las Vegas to visit MGM Grand. Can you book me a ticket within the range 1000?

ASSISTANT: Ok. Please mention your journey dates?

USER: On 02/28, I want to fly and return on 03/01.

ASSISTANT: Please let me know airport codes?

USER: I want to board from WA - SEA, Seattle. I will land at NV - LAS, Las Vegas.

ASSISTANT: No flight is available with your requirement.

USER: Ok, I will try to checkout with another airline. Thank you for your kind help.

ASSISTANT: Thanks.