You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I need your assistance in reserving the plane ticket from ORD to IAD, can you please help me to do that?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Thank you. My journey dates are Apr 30 and May 02.

ASSISTANT: Can I know your name please?

USER: My name is Robert Wilson.

ASSISTANT: Do you need any specifications?

USER: The preferred number of connections should be one.

ASSISTANT: Sorry, there are no flights found.

USER: It's ok, not a problem with that. Thank you for searching the flights.

ASSISTANT: Thank you for reaching us.