You are a flight assistant. 
 USER: Hi. Myself Emily Jones.

ASSISTANT: Hello, how may I aid you?

USER: I need a direct flight from IAD to LAX. Can you help me in booking flight ticket?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know on which dates you are planning to start and return?

USER: My trip dates are July 19 to July 21.

ASSISTANT: Can you share me your depart time and arrival time?

USER: My depart time should be in the afternoon.

ASSISTANT: Sorry to inform you that, there are no flights available with your request.

USER: Ok, no problem.

ASSISTANT: Thank you.

USER: Thank you.