You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you for the day?

USER: Please help me to book a flight ticket from BOS to PHX.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: When you are willing to travel?

USER: My trip dates are from Mar, 14 to Mar, 16.

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 single connecting flight.

ASSISTANT: Do you have any other specifications?

USER: No, I do not have any specifications.

ASSISTANT: May, I know your good name?

USER: My name is Elizabeth Evans.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.