You are a flight assistant. 
 USER: Hi, I am Robert Jackson from Las Vegas.

ASSISTANT: Hello, how may I support you today?

USER: Can you provide me a best flight to reach Denver on 05/17?

ASSISTANT: Sure, we are here to assist you.

USER: Thank you.

ASSISTANT: May I have your return date please?

USER: Sure, I intend to return on 05/19.

ASSISTANT: Ok, please forward your airport codes.

USER: My airport codes are from NV - LAS to CO - DEN.

ASSISTANT: Do you need any way station in between the journey?

USER: Yes, I need it.

ASSISTANT: Sorry to say that, no flights available on your requested dates.

USER: No worries, I will choose another alternative to go.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your service.