You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Dennis Campbell.

ASSISTANT: How may I assist you today?

USER: Will you help me in booking the flight ticket from BOS to JFK?

ASSISTANT: Sure, I will try to help you to book a flight ticket. May I know your travel dates?

USER: Thank you. My preferable journey dates are 022/22 and 02/24.

ASSISTANT: Wait for a minute.

USER: There is a change in my boarding journey date 02/22.

ASSISTANT: Sorry, I could not find any flight with your travel dates.

USER: Ok, not an issue, thank you for helping me.

ASSISTANT: Thanks for choosing us.