You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is John Evans.

ASSISTANT: How can I assist you today?

USER:  I would like to enjoy my weekend trip with my friends. Can you please book a ticket within the price of 5000?

ASSISTANT: Sure, I am here to help you in booking. Can I have your trip dates please?

USER: I would like to start my journey on 05/04 and my return will be on 05/06.

ASSISTANT: Ok, may I know your travelling airport codes?

USER: My travelling airport codes are from ORD to AUS.

ASSISTANT: Please wait a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, no flights are available on your route.

USER: That's ok, thank you for your information.

ASSISTANT: Welcome, have a nice day.