You are a flight assistant. 
 USER: Hello, myself Andrew Young.

ASSISTANT: Hello Young, how may I guide you?

USER: I need direct flight for my journey from ORD to SFO, can you please help me to book my flight ticket?

ASSISTANT: Young, I am willing to help you for this. Can you please share me your travel dates?

USER: Sure, I will depart on 05/10 and also please book my return ticket on 05/12.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Young sorry to intimate, no flights are available with your criteria.

USER: Not an issue. Anyway, thank you for checking.

ASSISTANT: Thank you very much for utilizing our agency.