You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you at this moment?

USER: Can you please book a flight ticket from EWR to ORD to attend a meeting in Chicago?

ASSISTANT: Ok, please share your travelling dates.

USER: My journey dates are on Sept 11th and 13th.

ASSISTANT: Ok, do you need a lay by in between the journey?

USER: No, I prefer a direct flight in my journey.

ASSISTANT: Ok, do you have any class preference?

USER: No.

ASSISTANT: Can I have your good name please?

USER: My name is Alexander Hall.

ASSISTANT: There are no flights found on your requested dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.