You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I am Samuel Miller. I am planning to travel from LAS to DFW, can you help in booking a flight?

ASSISTANT: Sure, We are here to help you. How much can you pay for buying your ticket?

USER: My budget is only 200.

ASSISTANT: On what dates you want me to book the ticket?

USER: My travelling dates are 10/25 to 10/27.

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

USER: Ok.

ASSISTANT: We are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: That's ok, thank you.

ASSISTANT: Thank you for contacting us.