You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Daniel Martin here.

ASSISTANT: How may I help you today?

USER: I want to attend a Seminar Washington. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I am happy to help you with that. Can you please share your preferable journey dates?

USER: My travelling dates are from 07/12 to 07/14.

ASSISTANT: Can you please share your source and destination airport codes?

USER: My airport codes are from EWR to DCA.

ASSISTANT: Please wait for a minute.

USER: Ok, I will wait.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching us.