You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you today?

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

ASSISTANT: Sure, may I know your good name?

USER: Michael Walker here.

ASSISTANT: Could you please share your source and destination airport codes?

USER: My airport codes are EWR-LGA.

ASSISTANT: May I know your planned travel dates?

USER: My trip dates are 05/23 and 05/25.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Is there any other specifications?

USER: I need break in my journey and I need return time should be evening.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, no flights are available on your route as per your given requirements.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you for choosing us.