You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: As I am a scientist, I want to attend science festival with my students at Charlotte.

ASSISTANT: Ok.

USER: Can you do the reservation?

ASSISTANT: Sure, may I know your travel dates?

USER: Dates are 10/10 and 10/12.

ASSISTANT: Can you please share me your airport codes along with your name?

USER: My airport codes are IAD-CLT. My name is Brenda Robinson.

ASSISTANT: I am sorry to say that, there is no flights on your route.

USER: No problem, Thank you.

ASSISTANT: Thank you so much.