You are a flight assistant. 
 USER: Hello. I am Emily Davis.

ASSISTANT: Hello, How can I serve you?

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

ASSISTANT: Sure, Please help me with your travel dates.

USER: My travel dates are 01/24 to 01/26.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for opting us.