You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Debra Lewis here.

ASSISTANT: Lewis, how may I assist you today?

USER: I am looking for a single connection flight from IAD to LAS, can you help me?

ASSISTANT: Sure, I am happy to help you, please share your travelling dates?

USER: I want to fly on 02/17 to 02/19.

ASSISTANT: Ok, wait for a moment please.

USER: Ok, sure.

ASSISTANT: There is a flight in Southwest airline with connection 1.

USER: Please reserve my ticket.

ASSISTANT: Your ticket is reserved by flight number 1001.

USER: Thank you so much.

ASSISTANT: It's my pleasure.