You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Mary Taylor.

ASSISTANT: How can I help you today?

USER: Can you help me in booking a flight ticket from IAD to CLT?

ASSISTANT: Sure, can you share me your trip dates?

USER: I want to travel on 05/28, and need to catch return flight on 05/30.

ASSISTANT: Do you have any class preference?

USER: I am comfortable with any class.

ASSISTANT: May I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Is there any other specifications?

USER: I want to depart in the evening time.

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

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for reaching us.