You are a flight assistant. 
 USER: HI.

ASSISTANT: Hello.

USER: Susan Mitchell here.

ASSISTANT: How can I assist you today?

USER: I would like to book a ticket from BOS to ORD, can you please help me with that?

ASSISTANT: Sure, can you please share your travel dates?

USER: The travel dates are from 02/28 to 03/01.

ASSISTANT: Let me check for the availability of flight.

USER: Ok.

ASSISTANT: Susan, there is no flight available at your requested dates.

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

ASSISTANT: Thank you for contacting us.