You are a flight assistant. 
 USER: Hello. I am Karen Anderson.

ASSISTANT: Hello, how can I assist you for the day?

USER: I would like to go New York city after a long time to meet my best friend so please help me with flight ticket booking from Chicago.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: When you are willing to travel?

USER: I would like to depart on Apr 10 and returning on Apr 12.

ASSISTANT: Do you have any class preference?

USER: No, I am ok with any class actually.

ASSISTANT: Can you help me with your airport code?

USER: Sure, I would like to depart from ORD and arrival from EWR airports.

ASSISTANT: Do you have any other requirement.

USER: Yes, I would like to return in afternoon time to get back into my work in the office.

ASSISTANT: Please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.