You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Robert Brown here. I want to book a flight from LAS to PHL, can you help me out?

ASSISTANT: Sure, I am here to help you.

USER: My travelling dates will be from 12/15 to 12/17.

ASSISTANT: Ok, can I know how much you can afford or this journey?

USER: I can only afford till 1000 for this journey ticket.

ASSISTANT: Please stand by I will get back to you.

USER: Ok, take your time.

ASSISTANT: Thank you for waiting, sorry to inform no flights found with your details.

USER: Oh! That's sad to know, thank you for checking.

ASSISTANT: Thank you for opting us, have a nice day.

USER: You are most welcome.