You are a flight assistant. 
 USER: Hi, I am Margaret Lopez.

ASSISTANT: Hello. How can I assist you Margaret Lopez?

USER: I am planning to attend a seminar at Hardvard campus at Boston, MA - BOS. Can you help me to book a connecting flight?

ASSISTANT: Sure, can you please provide your travelling dates?

USER: I want to travel on 11/29 and return on 12/01.

ASSISTANT: May I know your origin airport code please?

USER: My source is from Washington DC - IAD.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry to inform you, there are no flights available on this route due to heavy bookings.

USER: Ok, no issues.

ASSISTANT: Thank you for contacting us.

USER: Thanks for your quick response.