You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I want to travel from IAH to IAD. Can you help me to book a flight ticket?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: I want to fly in the flight on Nov 15 and Nov 17.

ASSISTANT: Do you have any preferences?

USER: I want to travel in a connecting flight.

ASSISTANT: May I know your name please?

USER: Jerry Smith.

ASSISTANT: Sorry, there is no flight available with your given dates.

USER: That's ok. Anyways, thank you.

ASSISTANT: You are welcome, have a nice day.