You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I need to book a flight ticket from PHL to BOS, Can you please help me for booking?

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

USER: I would like to travel on 04/28 to return on 04/30.

ASSISTANT: Do you have any class preference?

USER: I am comfortable with any class.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: May I know your name?

USER: Robert Thomas here.

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

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.