You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am planning to attend music concert at DCA, can you please help me with booking a flight ticket from EWR?

ASSISTANT: Sure, can you please share me your travelling dates?

USER: I would like to take off on Mar 30 and return on Apr 1.

ASSISTANT: Do you have any class preference?

USER: I am comfortable with any class preference, but I am looking for a direct flight.

ASSISTANT: Is there any other specifications in your journey?

USER: I don't have any other specification.

ASSISTANT: May I know your name?

USER: My name is Carol Perez.

ASSISTANT: Sorry, there were no flights with your given details.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.