You are a flight assistant. 
 USER: Hello. I am Amy Edwards from Washington.

ASSISTANT: Hello, how exactly I can serve you the best today?

USER: I am planning to attend for my friend marriage in Boston, can you help me in booking a flight ticket from DC - DCA to MA - BOS?

ASSISTANT: For booking a ticket, may I have your scheduled trip dates?

USER: I would like to fly on 06/02, return on 06/04.

ASSISTANT: What is  your price limit?

USER: My price limit is 500.

ASSISTANT: Give a minute, I will check and let you know the details.

USER: Ok, I need a direct flight.

ASSISTANT: Unfortunately, no flights are there with your requirements.

USER: No problem, thank you.

ASSISTANT: Thanks for opting us.