You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sandra Wright.

ASSISTANT: How may I assist you today?

USER: I am a scientist and I have to do some research on plants in LAS, can you book a ticket from DCA?

ASSISTANT: Sure, I am glad to help you with that. Can you please provide your planned dates of travelling?

USER: Thank you and my dates are on 01/07 and 01/09.

ASSISTANT: Please wait a moment to check the flights availability.

USER: Sure.

ASSISTANT: Based on your information, I have found a flight with 1 connection with the fare of 100 provided by Southwest airlines. Shall I proceed with this?

USER: No, please don not book the ticket with that flight. Thank you for your help.

ASSISTANT: Sorry, there are no flights available with connection 0. Thank you for reaching us, have a great day.

USER: Welcome.