You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, Good Evening.

USER: My name is Sharon Robinson. Good Evening.

ASSISTANT: Sharon, how may I aid you?

USER: I heard Los Angeles is a great place to visit in Summer, so I want to travel from IAD to LAX.

ASSISTANT: That's a great place to visit. Will you please tell me on which dates you are interested to travel?

USER: I would like to depart on 04/07 and return back on 04/09.

ASSISTANT: Ok Sharon, please hold on for a moment so that I can search for the availability of flights on your requested dates.

USER: Sure, take your time.

ASSISTANT: Sorry for the inconvenience, there are no flights available which satisfies your requirements.

USER: That's ok, thank you for your time.

ASSISTANT: Thank you for reaching us.