You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am Charles Lee. I am an old person and I am unable to reserve a flight ticket for my journey, can you please find a flight which will depart in afternoon time?

ASSISTANT: Sure, can you share your trip dates?

USER: Thank you for considering my request and my trip dates are Apr 30 and please book the return ticket on May 2nd.

ASSISTANT: May I know your journey airport codes?

USER: Sure, my regional airport codes are from DFW to JFK locations.

ASSISTANT: Do you have any preferences?

USER: I am looking for a single stop over in my journey.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: No problem , I can ask one of my friend to help me to reach my location. Thank you for your help.

ASSISTANT: Thank you for reaching us.