You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Donald Green here.

ASSISTANT: How may I help you at this moment?

USER: Can you book a connecting flight to Chicago for my business trip?

ASSISTANT: Sure, please provide me your travel dates.

USER: My travelling dates for journey are 07/06 07/08.

ASSISTANT: May I know your travel airport codes?

USER: My airport codes for boarding the flight are SEA to ORD.

ASSISTANT: Please wait for a minute.

USER: My price limit is less than 500.

ASSISTANT: Sorry, I could not find any flight with your travel dates.

USER: That's not a problem. Thank you.

ASSISTANT: It's my pleasure.