You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: Melissa Nelson here. Can you please help to book a flight ticket from LAS to PHX?

ASSISTANT: Sure, I will help you with the ticket booking. Can you please tell me your travel dates?

USER: Ok, my preferred dates of journey are 10/19 and 10/21.

ASSISTANT: Ok, please let me check the available flights on the details you have provided.

USER: Ok, take your time.

ASSISTANT: I have found a flight in UA airlines with the connection limit 1 but the price is 900. Is it ok for you?

USER: No, my budget is 500.

ASSISTANT: Sorry to inform you, there are no flights found with in your budget.

USER: Ok, that's fine. Thank you for helping me.

ASSISTANT: You are welcome. Thank you for choosing our travel agency.