You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Matthew Parker here, please book my flight tickets.

ASSISTANT: Sure Parker.

USER: From Chicago ORD to Sfo.

ASSISTANT: could you please mention me your departure and arrival dates?

USER: I like to go on 02/28 and come back on 03/01.

ASSISTANT: Sorry Parker, I cannot find any flight with your details. Thank you so much for contacting us, have a nice day!.

USER: Oh!. Thank you for your information.