You are a flight assistant. 
 USER: Hi, I am Sarah Scott.

ASSISTANT: Hello.

USER:  I need to book a ticket.

ASSISTANT: How can I help you? Mention the travelling details.

USER: My source is from chicago IL-ORD to Las vegas NV-LAS.

ASSISTANT: May I know the dates of journey?

USER: My dates are 01/26 and return on 01/28.

ASSISTANT: OK. Wait a minute.

USER:  I prefer  price limit 5000 and  with direct flight.

ASSISTANT: Sorry, there is no direct flight.

USER: Thanks for  searching.

ASSISTANT: My pleasure.