You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Catherine Collins.

ASSISTANT: How may I assist you now Catherine Collins?

USER: I am planning to visit Washington IAD to meet my best friend from Chicago ORD. Can you make a reservation for me?

ASSISTANT: Sure, I will help you. Can you please tell your desired dates for this journey?

USER: Thank you. my itinerary dates are on Aug 05 and return on Aug 07.

ASSISTANT: Do you have any depart and arrival time preferences?

USER: Yes, I want to depart in the morning time.

ASSISTANT: Do you need a connecting flight?

USER: Yes, I need a single connecting flight to travel.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: Sorry to say, there are no flights available for your journey.

USER: That's ok, not an problem.

ASSISTANT: Have a nice day.

USER: Thank you for your information.