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

ASSISTANT: Hello, How can I help you?

USER: I want to book a direct flight to attend for a Client meeting at Washington, DC - IAD. Can you please help me for booking?

ASSISTANT: Sure, Can I know your trip dates?

USER: My travelling dates are 09/11 and 09/13.

ASSISTANT: Ok, from where you want to board?

USER: I want to board from Charlotte, NC - CLT.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, no flights available with your given details.

USER: Ok, no worries. Thank you.

ASSISTANT: Thanks for choosing us.