You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I amend you today?

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

ASSISTANT: Ok.

USER: Can you do the reservation?

ASSISTANT: Sure, I am here to do. May I have your travel dates?

USER: Dates are 10/22 and 10/24.

ASSISTANT: What is you nearest airport to board at?

USER: My airport codes are PHX-DFW.

ASSISTANT: Please share your name.

USER: Melissa Jones here.

ASSISTANT: Thanks for sharing all your details, but sorry to inform you that no flights will run on respective dates.

USER: No problem, Thank you.

ASSISTANT: Thanks for availing us, Have a nice day.