You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I am Joshua Evans. Can you help me in booking a ticket from SFO to IAD with 1 connection?

ASSISTANT: Ok, please tell me your travelling dates?

USER: My travelling dates are 09/22 to 09/24.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to inform you Evans, there are no flights found with the details you given.

USER: Thank you for the information.

ASSISTANT: You are welcome.