You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Please help me to book a flight ticket from DCA to LGA.

ASSISTANT: Sure, may I know your travel dates?

USER: My travelling dates are 19 to 21 of Nov.

ASSISTANT: Please share me your name.

USER: I am Donna Phillips.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight.

ASSISTANT: Flight-1007 is available with Frontier airlines having single connection and the ticket costs you 200 only in economy class. Are you comfortable with this flight?

USER: Please proceed.

ASSISTANT: Your ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you.