You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am having a vacation on 03/13. So I like to fly NV - LAS to have a stress relief from work. Can you help to book a flight ticket?

ASSISTANT: Sure, will you provide your return details?

USER: Yes, my return date is 03/15.

ASSISTANT: Please provide your airport code also.

USER: My source airport is DC - IAD.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: May I know your name please?

USER: Myself Frank Campbell.

ASSISTANT: Unfortunately, there is no flights found under your details.

USER: Ok, it's fine.Thank you the help.

ASSISTANT: Thank you for reaching us.Have a great day.