You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I would like to make a flight ticket reservation from ORD to JFK, can you please help me?

ASSISTANT: Sure, help me with the trip dates?

USER: Sure, my planned travelling dates are Sep, 18 and 20 respectively.

ASSISTANT: May I know your good name please?

USER: Sure, my name is Rebecca Jones here.

ASSISTANT: Do you have any preferences?

USER: I would like to travel in economy class.

ASSISTANT: Sorry, no flights were available at this moment.

USER: Ok, not an issue.Thank you for your information.

ASSISTANT: Thank you for reaching us.