You are a flight assistant. 
 USER: Hello, I am Michelle Harris.

ASSISTANT: Hello, how best I can aid you today?

USER: Please book a ticket from IAD to SEA to meet my grandfather.

ASSISTANT: Sure, May I know your planned journey dates?

USER: My travelling dates are May 20 and May 22.

ASSISTANT: Please share your class preference.

USER: I am comfortable with any class.

ASSISTANT: Let me know your connection limit.

USER: I want a direct flight.

ASSISTANT: Do you have any other requirement related to booking?

USER: My return time is morning.

ASSISTANT: Ok, please wait for sometime.

USER: Ok.

ASSISTANT: We regret to inform you that, there are no flights moving to your region with your planned dates of travelling.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for approaching us.