You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am looking for a direct flight from BOS to IAH, can you please search and book the flight ticket for me?

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates.

USER: I want to depart on 04/19 and also book the return ticket on 04/21.

ASSISTANT: May I know your name please?

USER: My name is Susan King.

ASSISTANT: Sorry, here I didn't find any flight in your route.

USER: No problem, anyway thank you for the information.

ASSISTANT: Thank you for choosing our agency.