You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I want to book a flight from MSP to SFO, can you help me?

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

USER: My travelling dates will be from 10/19 to 10/21.

ASSISTANT: May I know your name to proceed further?

USER: My name is Kevin Smith.

ASSISTANT: Ok, let me check for the availability of flight on this route.

USER: Ok, take your own time and let me know the flight availability details.

ASSISTANT: Kevin, I am sorry to inform you that there is no flight at your request.

USER: Oh! That's sad to hear from you. Anyways, thank you for assisting me.

ASSISTANT: Sorry for the inconvenience. Thank you for contacting us.

USER: You are welcome.