You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How can I help you?

USER: I need to book a flight ticket from Detroit to attend a seminar on global warming at Las Vegas. Can you help me with it?

ASSISTANT: Sure, may I know on which dates you want to travel?

USER: I prefer to travel on 03/14 and 03/16.

ASSISTANT: Could you please help me by providing your airport codes?

USER: They are from DTW to LAS.

ASSISTANT: Do you have any price limit?

USER: It should not exceed 500.

ASSISTANT: Ok, please give me a moment.

USER: Sure.

ASSISTANT: Sorry, I found no flights on your scheduled dates. May I know your name?

USER: My name is Sandra Wright.

ASSISTANT: Thank you for reaching us Sandra Wright.

USER: Thank you for your response.