You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I would like to travel from MSP to EWR. Can you please help me in ticket booking?

ASSISTANT: Sure, on what dates will you be travelling?

USER: My trip dates are from 04/20 to 04/22.

ASSISTANT: How many connections do you need?

USER: I want a single connection.

ASSISTANT: Is there any class preference?

USER: My class preference is economy class.

ASSISTANT: Do you have any other specifications?

USER: I want to travel in the evening.

ASSISTANT: May I know your name?

USER: Myself Cynthia Johnson.

ASSISTANT: Do you want to depart in the evening or return in the evening?

USER: Departure time.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for waiting, there are no flights going on your way at this moment.

USER: It's ok, thank you.

ASSISTANT: Thank you for choosing us.