You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Shirley Carter, can you help me to book a flight from JFK to MSP?

ASSISTANT: Sure, please share your planned travel dates.

USER: My travelling dates are May 20 and May 22.

ASSISTANT: Do you have any class preference?

USER: I am looking for a economy class.

ASSISTANT: We don't have any flight between JFK and MSP on given dates by you.

USER: Ok, no issues, thank you for your time.

ASSISTANT: Thank you for reaching us, hope to serve your better next time.