You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I render you?

USER:  As I am a scientist, I want to attend science festival with my students at Oakland. Can you do the reservation?

ASSISTANT: Sure, I can help you. Please share your journey dates?

USER: Dates are 06/15 and 06/17.

ASSISTANT: May I know your boarding and landing airport codes?

USER: My airport codes are MSP-OAK.

ASSISTANT: May I know your name please?

USER: Gary Scott here.

ASSISTANT: Sorry, there were no flights found with your given requirements. Thanks for opting us.

USER: No problem, Thank you.