You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

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

ASSISTANT: Please share your trip dates.

USER: My journey dates are 06/22 and 06/24.

ASSISTANT: Do you need any halt in between the journey?

USER: I need break in my journey.

ASSISTANT: May I know your airport codes?

USER: My airport codes are PHX-OAK.

ASSISTANT: Please give your departure and arrival timings.

USER: Departure and arrival timings should be evening.

ASSISTANT: Do you need any class preference?

USER: No, I do not have.

ASSISTANT: Please wait a while.

USER: Ok.

ASSISTANT: Sorry to inform you, There are no flights available in your route.

USER: No problem, Thanks for the information.

ASSISTANT: may I know your name please.

USER: Richard Martinez here.