You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you now?

USER:   I want to book a flight ticket from BOS to LAS, can you help me with it please?

ASSISTANT: Sure, I am here to help you. May I know your travel dates, please?

USER: My travelling dates are Feb 26 and Feb 28.

ASSISTANT: Do you have any connection limit?

USER: I need a direct flight.

ASSISTANT: May I know your class preference?

USER:          No,  but I need a ticket under normal cost.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Let me know your name to proceed further.

USER:      My name is Ruth Green.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Unfortunately, there are no flights available as per your specifications.

USER: That's ok, thank you for the response.

ASSISTANT: Thanks for reaching us.