You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Sandra King. I would like to book a ticket to visit a new place at SFO. Can you please help me out to book a ticket from IAD?

ASSISTANT: Sure, kindly share your travel dates.

USER: Thank you for your response, I want to take off on Dec 21 and book my return ticket also on Dec 23.

ASSISTANT: Do you have any connection preference?

USER: Yes, I want 1 halt in between my journey.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: Oh! It's ok no problem.

ASSISTANT: Thanks for reaching us.

USER: Thank you for your information.