You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I serve you?

USER: Can you please book a flight to Los Angeles, LAX?

ASSISTANT: Sure, May I know the source code?

USER: Sure, it's Washington, IAD.

ASSISTANT: Please help me with your travel dates.

USER: I would like to travel on 02/05 to 02/07.

ASSISTANT: May I know your name?

USER: I am Katherine Green.

ASSISTANT: Please wait a minute.

USER: Sure.

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

USER: Ok, thanks for the quick response.

ASSISTANT: Thank you for opting us.