You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Mark Hernandez want to book a ticket to OAK from MSP, can you please help me in booking?

ASSISTANT: Yes, can you tell me your dates of travel?

USER: My travel dates are from Mar 23 to Mar 25.

ASSISTANT: Give me a moment.

USER: Ok.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Welcome.