You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Myself Jonathan Lee, can you help me to book a flight from BOS to IAD?

ASSISTANT: Sure, I can help you with that. May I know your travel dates please?

USER: Ok, my travel dates are 07/22 and 07/24 respectively.

ASSISTANT: Ok, please wait for a while.

USER: Ok, I will wait.

ASSISTANT: There are no flights available for you on those dates.

USER: Ok, not a problem. Thank you for the information.

ASSISTANT: Thank you for choosing us.