You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I serve you?

USER:  Can you please book a flight ticket from EWR to DCA?

ASSISTANT: Sure, may I know your depart and return dates to proceed ahead with the booking?

USER: My travelling dates are 07/26 and 07/28.

ASSISTANT: Do you have any restriction with time for your depart and return?

USER: No, I am comfortable to travel at any time.

ASSISTANT: Is there any specific airline are you looking for?

USER: I am looking for normal cost airline.

ASSISTANT: May I know your name please?

USER: My name is Gary Harris.

ASSISTANT: Please share is you want to add any other request to your journey.

USER: I need a connecting flight.

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: We have a flight from Delta airlines which is fulfilling all your requests and it is costing only 200 to you. Do you want me to continue with it?

USER:      Yes, please.

ASSISTANT: Your ticket has been confirmed in economy class and the flight number is 1015.

USER: Thank you.

ASSISTANT: Thank you for allowing us to serve you.