You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please book the ticket from LAS to IAH? As I'm planning to visit Houston.

ASSISTANT: Sure, can you please share me your travelling dates?

USER: Sure, I would like to depart from my source location on 5th Dec and I want to return back by 7th Dec.

ASSISTANT: Do you have any connection limit?

USER: I prefer single connected flight.

ASSISTANT: Is there any other specifications?

USER: I don't have any other specifications.

ASSISTANT: May I know your name?

USER: My name is Emily Nelson.

ASSISTANT: Sorry, there were no flights with your given details.

USER: That's ok, thank you for giving the information anyways.

ASSISTANT: Thank you for reaching us.