You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,.

USER: Myself Ashley Smith.

ASSISTANT: How may I serve you?

USER: I want to book a flight ticket to go for a Yosemite Adventure in Las Vegas, NV - LAS. Can you please book a flight ticket from Dallas & Fort Worth, TX - DFW?

ASSISTANT: Sure, can you please help me with the dates?

USER: I will return on 10/26 and wish to travel on 10/24.

ASSISTANT: Do you have any price limit?

USER: Please make sure that, the price should not exceed 200.

ASSISTANT: Sorry, no flights were running to your destination.

USER: It's ok, thank you.

ASSISTANT: Thank you for opting us.