You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I am planning to visit Los Angeles, will you help me in booking the flight ticket from IAD to LAX?

ASSISTANT: Ok, I am here to help you with that. Can I know your planned trip dates?

USER: My preferable journey dates are Apr 29 and May 01.

ASSISTANT: May I know your good name?

USER: Myself Virginia Johnson.

ASSISTANT: Ok, do you have any other requirements?

USER: No, thank you for asking.

ASSISTANT: Ok, please wait for a minute.

USER: Ok, I will wait.

ASSISTANT: Sorry to say that, there are no flights available based on your travelling dates.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for approaching us.