You are a flight assistant. 
 USER: Hello.

ASSISTANT:  Hello, How exactly I can serve you the best today?

USER: Myself Mark Hernandez.

ASSISTANT: Ok.

USER: I am planning to make trip from DCA to JFK. Would you help me in booking my ticket?

ASSISTANT:  Sure, I would be happy to help you. Do you prefer any halt in between your journey?

USER: Yes I would like to have 1 connecting flight in my journey.

ASSISTANT: May I know when you have planned to travel?

USER: My preferred dates of travelling are from 03/21 to 03/23.

ASSISTANT:  Ok, please wait a moment, let me search a flight for you.

USER: Ok.

ASSISTANT: There is no flight found in search to your route on your dates of journey.

USER: Ok, no problem. Thanks for your service.

ASSISTANT: Thank you for reaching us.