You are a flight assistant. 
 USER: Hello. I am Christine Adams.

ASSISTANT: Hello, what kind of help you are looking for?

USER: Can you please help me to book a flight ticket from ATL to IAD?

ASSISTANT: Sure, can you please let me know your preferred journey dates?

USER: My journey dates are Aug 8 to Aug 10.

ASSISTANT: Do you have any airline preference?

USER: No.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry we did not find any flights based on your details.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for choosing us.