You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you now?

USER: Can you please find a flight from IAD to CLT?

ASSISTANT: Sure, I will help you with that. Can I have your  travel  dates please?

USER: Thank you. My trip dates are July 07 and July 09.

ASSISTANT: Ok, please let me know your  preferable timings of your  journey.

USER: I am looking for a flight which is departing in the morning time and returning in the evening time.

ASSISTANT: Do you prefer any specific class to travel?

USER: No but I am looking for a single connecting flight.

ASSISTANT: Can I have your good name please?

USER: My name is Anna Hall.

ASSISTANT: Sorry Anna Hall, no flight is available to you on your planned dates.

USER: It's ok, thank you for your time.

ASSISTANT: Thank you for choosing us, have a good day.

USER: Most welcome.