You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you now?

USER: I am planning to spend my free time with my grand parents at Las Vegas, can you help me with booking a connecting flight?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please share me your source and destination airport codes?

USER: My source and destination airport codes are IAD and LAS.

ASSISTANT: Do you want direct flight for this journey?

USER: No, I need a connecting flight.

ASSISTANT: Please mention when you planned to travel?

USER: I will fly on Oct 22 and recur on Oct 24.

ASSISTANT: Do you have any other requirement?

USER: No, I don't have any more requirements.

ASSISTANT: May I know your good name?

USER: Eric Martin here.

ASSISTANT: Thank you for your name, sorry there is no flight available on your given journey dates.

USER: Ok, that's not a problem. Thank you for your information.

ASSISTANT: Thank you for reaching us, we hope see you again.