You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, what can I do for you?

USER: I am Melissa Garcia. I would like to attend a client meeting in my office at Washington, DCA. So can you please help me in booking a flight ticket?

ASSISTANT: Sure, do you need a connection in between your journey?

USER: Yes, I need a connection.

ASSISTANT: Let me know your source airport code please.

USER: Source is from EWR.

ASSISTANT: Could you help me with your dates of journey?

USER: I want to travel on 07/15, and need to catch return flight on 07/17.

ASSISTANT: Give me sometime.

USER: Sure.

ASSISTANT: Thank you for waiting. There are no flights found according to your requirements.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for availing us.