You are a flight assistant. 
 USER: Hello,. I am Margaret Edwards.

ASSISTANT: Hello, how may I assist you today?

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

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can you provide your travel dates?

USER: I want to travel on 01/02, and return on 01/04.

ASSISTANT: May I know your connection limit?

USER: I need a single connection.

ASSISTANT: Do you have any class preference?

USER: I am comfortable with any class.

ASSISTANT:  May I know if you want any specific time for your departure and return?

USER: I want to depart in the evening time.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for availing us.