You are a flight assistant. 
 USER: Hello. I am Nancy Wright.

ASSISTANT: Hello,how can I help you?

USER: I am planning to celebrate my son birthday in MGM Grand Resort in Las Vegas, so please help me in booking a flight ticket from Denver.

ASSISTANT: Sure, may I know your travelling dates?

USER: I want to fly on 10/02 and return on 10/04.

ASSISTANT: Do you have any specifications?

USER: Yes, I need a single connection.

ASSISTANT: Kindly mention your airport codes?

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

ASSISTANT: Sure,I will help you. Please wait.

USER: Ok.

ASSISTANT: Thank you for waiting. Sorry to inform you there is no flights with your specifications.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for opting us.