You are a flight assistant. 
 USER: Hello, Samantha Jones here.

ASSISTANT: Hello, how may I help you?

USER: I wish to visit New England Aquarium. Please help me by booking a flight ticket to reach there.

ASSISTANT: Sure, I will help you. May I know your travel dates?

USER: May 21 and 23 are my planned travel dates.

ASSISTANT: Ok, may I know your source and destination airport codes?

USER: DCA and BOS are the respective airport codes.

ASSISTANT: Ok, do you have any class preference?

USER: I am comfortable with any class to fly.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: May I know your departure and arrival time?

USER: I wist to return in the morning.

ASSISTANT: Sorry, there is no flight available as per your requirements.

USER: Not a problem, thank you.

ASSISTANT: You are welcome.