You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Katherine Moore, I want to book a flight to meet my sister under fare of 500. can you help me with booking?

ASSISTANT: Sure, may I know your planned travel dates?

USER: I will fly on 05/03 and return on 05/05.

ASSISTANT: May I know your source and destination codes?

USER: I will travel from IL-ORD to AZ-PHX.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, sorry to say that, no flights were found with your given details.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for opting us.