You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I be your helping hand today?

USER: Can you please help me in booking the flight ticket from IAD to OAK?

ASSISTANT: Can you please share your travelling dates?

USER: My departure date is Jan 14th and my return date is Jan 16th.

ASSISTANT: Ok, do you have any airline preference?

USER: I prefer to travel in normal cost airlines with single connection.

ASSISTANT: Do you have any other requirements?

USER: I would like to depart in the afternoon.

ASSISTANT: May I know your good name please?

USER: I am Margaret Roberts.

ASSISTANT: There are no flights found on your requested dates.

USER: Thank you for the information.

ASSISTANT: Thank you for reaching us.