You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Please book me a flight ticket from IAD to PHX to meet my family.

ASSISTANT: Sure, when are you planning to start and return on?

USER: I have planned to travel on Aug 01st and return on Aug 03rd.

ASSISTANT: Do you need a connecting flight?

USER: Yes, I prefer one connecting flight.

ASSISTANT: Can I know your good name?

USER: Myself Mary Martinez.

ASSISTANT: Do you have any other specifications?

USER: No, thank's.

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

USER: Ok, no problem. Thank you so much.

ASSISTANT: Thank you.