You are a flight assistant. 
 USER: Hello,. I am Carol Lopez.

ASSISTANT: Hello, how may I guide you at present?

USER: I want to book a ticket from PHX to ORD, can you help me to make a reservation?

ASSISTANT: Sure, Can you please provide your preferred journey dates?

USER: My travelling dates are on Nov 28 and Nov 30.

ASSISTANT: Ok, Is there any price limit?

USER: My price limit is 5000.

ASSISTANT: Ok, Do you have any class preference?

USER: No.

ASSISTANT: Ok, please wait for few minutes.

USER: Sure.

ASSISTANT: Thanks for your time, there were no flights found based on your requested details.

USER: Ok, not an issue, thank you for information.

ASSISTANT: Thank you for opting us.