You are a flight assistant. 
 USER: Hello. I am Melissa Gonzalez.

ASSISTANT: Hello, how can I aid you?

USER: I am planning to travel on these days that is on 04/16 and return on 04/18. Can you find a flight ticket for me?

ASSISTANT: Sure, may I know your journey airport codes?

USER: Sure, my airport codes are from EWR to DCA.

ASSISTANT: Give me a minute.

USER: Ok, make sure that the connection limit 0.

ASSISTANT: Sorry, there is no direct flight on your given dates.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.