You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I want to book a ticket from MSP to IAD. Could you book a ticket?

ASSISTANT: Sure, can you please specify me your dates of travel?

USER: Departure is May, 11 and return date is May, 13.

ASSISTANT: Do you like to go with a economy class or business class?

USER: I would like to prefer business class.

ASSISTANT: Do you have any particular time for departing and returning?

USER: I would like to depart in the afternoon.

ASSISTANT: May I know your name?

USER: My name is Matthew Gonzalez.

ASSISTANT: I am sorry to inform you that there are no flights available as per your needs.

USER: Thank you.

ASSISTANT: Welcome Matthew Gonzalez.