You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you now?

USER: Please book me a flight ticket from PHL to DCA to meet my family.

ASSISTANT: Sure, please share me when you planned to travel?

USER: I  have planned to travel on Oct 16th and return on Oct 18th.

ASSISTANT: Do you want a connecting flight or direct flight?

USER: I prefer connecting flight.

ASSISTANT: Please mention your depart and return flight timing?

USER: I am ok with any time.

ASSISTANT: Is there any other requirement?

USER: No, thanks.

ASSISTANT: May I know your good name?

USER: Kevin Smith.

ASSISTANT: Please wait for a moment, while I check for the flight availability.

USER: Ok, I will wait.

ASSISTANT: Thank you for waiting, sorry there is no flight found on your given journey data.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for visiting us, we hope see you again.