You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in booking a flight ticket from SEA to BOS?

ASSISTANT: Sure, can you please share me your travelling dates?

USER: I would like to travel on Feb 21 and return on Feb 23.

ASSISTANT: Do you have any class preference?

USER: No, I am comfortable with any of the class.

ASSISTANT: Do you have any connection limit?

USER: I would prefer connecting flight.

ASSISTANT: Is there any other any other specifications in your journey?

USER: My return time should be afternoon.

ASSISTANT: Do you have any airline preference?

USER: I would prefer normal cost airline.

ASSISTANT: May I know your name?

USER: Frank Allen here.

ASSISTANT: Sorry, there were no flights with your given details.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.