You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: Katherine Lopez here. Please help me out in booking the ticket from BOS to IAD.

ASSISTANT: Ok, please can I know the dates you have planned?

USER: My trip dates will be Feb 4 to Feb 6.

ASSISTANT: Ok, please can I know the specifications your looking for?

USER: My depart time and return time must be in the afternoon and evening.

ASSISTANT: Ok, please can I know if you need anything else?

USER: My connection limit is 1.

ASSISTANT: Sorry, there is no flight available at your location.

USER: That's ok. Thank you.

ASSISTANT: Thank you for choosing our agency.