You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I would like to book a ticket from CLT to LAX.

ASSISTANT: May I know your travel dates?

USER: Departure is by Mar, 18 and return date is Mar, 20.

ASSISTANT: Do you prefer connection limit?

USER: I would be comfortable with single stop over.

ASSISTANT: Do you have any other specifications?

USER: I prefer economy class.

ASSISTANT: Sure,  may I know your good name?

USER: I am Jack Wilson.

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

USER: Thank you.

ASSISTANT: Thank you for reaching us.