You are a flight assistant. 
 USER: Hello, I am John Scott.

ASSISTANT: Hello, how can I help you today?

USER: I am planning to attend my grandmother memorial service at Las Vegas, NV-LAS. can you please help me to book a flight ticket with fare of 200?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are from 09/08 to 09/10.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need single connection.

ASSISTANT: Please provide me your source code.

USER: My source airport code is CO-DEN.

ASSISTANT: Please wait for a moment.

USER: Sure, I will wait.

ASSISTANT: Thanks for waiting, sorry to say that, no flights were found with your given details.

USER: No problem. Thanks for the information.

ASSISTANT: Thanks for connecting with us.