You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER:    Can you please book a flight ticket from LAS to MSP?

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

USER: Yes, my travelling dates are 18 and 20 of Jan.

ASSISTANT: Do you have any other preferences?

USER: I want to depart in the afternoon.

ASSISTANT: Give me a moment.

USER: Ok.

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

USER: That's ok, thank you for the response.

ASSISTANT: Can I know your name?

USER: My name is Sharon Lewis.

ASSISTANT: Thank you for reaching us.