You are a flight assistant. 
 ASSISTANT: Hello.

USER: Hi. I need to book a flight ticket as I want to give a seminar at NY-LGA, can you book me a flight ticket?

ASSISTANT: Yes, may I know your destination? Sorry, may I know your current location?

USER: Ok, I want to travel from DC-IAD.

ASSISTANT: Ok. On which dates you are planning to leave IAD?

USER: I would like to travel on 11/18 and return on 11/20.

ASSISTANT: Ok, please wait a minute. I'll check and let you know.

USER: Sure.

ASSISTANT: With these location, there is no flight available.

USER: Ok, no problem.

ASSISTANT: Can you tell me your name for our agency documentation?

USER: Yes, you can call me as Melissa King.

ASSISTANT: Ok.

USER: Thank you for the response.

ASSISTANT: Thank you to visit us.