You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: As I am a scientist, I want to attend science festival with my students at Chicago. Can you do the reservation?

ASSISTANT: Sure, when are you planning to travel?

USER: Dates are 06/27 and 06/29.

ASSISTANT: Please provide your airport codes.

USER: My airport codes are PHL-ORD.

ASSISTANT: May I know your name?

USER: Linda Wilson here.

ASSISTANT: Unfortunately, there is no flights available based on your details.

USER: No problem, I will check with another airline.

ASSISTANT: Thank you.

USER: Thank you for availing us.