You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I aid you?

USER: I am Elizabeth Phillips. I have a plan to visit MIT museum to watch the exhibition of science and technology in Boston with my sister. I would like to book a flight ticket.

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

USER: My destination is from MA-BOS and source is from FL-MCO.

ASSISTANT: Let me know your depart and return dates?

USER: My depart is on 09/27 and return on 09/29.

ASSISTANT: Ok, please wait for minute.

USER: Sure.

ASSISTANT: Thanks for you patience, sorry to inform there are no flights on your required dates.

USER: Ok, Thank you.

ASSISTANT: Thanks for approaching us.