You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, when are you willing to fly?

USER: Dates are 10/11 and 10/13.

ASSISTANT: Ok, let me know your airport codes?

USER: My airport codes are LAS-DTW.

ASSISTANT: Ok, any other requirements?

USER: Price should not cross 5000.

ASSISTANT: Ok, please wait for a while.

USER: I need halt in my journey.

ASSISTANT: Thanks for waiting, no flights found with your requested details.

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

ASSISTANT: Thank you for opting us.