You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Can you please help me in booking a flight ticket from ORD to EWR?

ASSISTANT: Sure, please provide your trip dates.

USER: I want to fly on July 21 and return on July 23.

ASSISTANT: May I know your connection limit?

USER: I need a single connection.

ASSISTANT: May I know your name?

USER: Myself Nicole Adams.

ASSISTANT: Do you have any preferences in your journey?

USER: I would like to prefer an economy class.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry Nicole Adams, no flights are available on your route.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for reaching us.