You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how best can I guide you today?

USER: Can you please reserve a flight ticket from IAD to PHL, can  you please help me?

ASSISTANT: Sure, when do you want to start and return on?

USER: Sure, my planned travelling dates are Jan, 23 and 25 respectively.

ASSISTANT: Do you need a connecting flight?

USER: Yes, I am looking for a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: Yes, I would like to depart in afternoon.

ASSISTANT: Can I know your good name?

USER: Sure, my name is Donna Brown.

ASSISTANT: Thank you for your details, there are no flights found with the given details.

USER: Ok, not an issue.Thank you for your information.

ASSISTANT: Thank you.