You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Richard Collins.

ASSISTANT: How can I help you?

USER: I would like to travel SFO, can you please help me to book a flight ticket from MSP?

ASSISTANT: Can I know your travelling dates?

USER: Sure, my journey dates are May 27 and May 29.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Do you have any other preferences?

USER: My return time is evening.

ASSISTANT: Connecting flight can be booked with airline Spirit for price 300 having flight number 1003.

USER: Ok, please book.

ASSISTANT: Ticket is booked.

USER: Thank you for your help.

ASSISTANT: Thank you.