You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Christine Thomas from Boston. I have to go Washington next week, can you please book a direct flight for me?

ASSISTANT: Sure, can you please tell your travelling dates?

USER: I want to take off on 06/10 and book my return ticket also on 06/12.

ASSISTANT: Please wait for a while to check a flight availability.

USER: I want to fly from BOS and destination airport is IAD.

ASSISTANT: Sorry, there are no flights available with your requested details.

USER: Oh! it's ok no problem, I will go with another airline. Thank you for your information.

ASSISTANT: Thank you and have a nice day.