You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am Anthony Smith. I need a direct flight to Denver, DEN. Can you help me in booking from Houston, IAH?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: On which dates you want me to book a flight ticket for you?

USER: My travelling dates are from 10/23 to 10/25.

ASSISTANT: Do you have any fare limit?

USER: I can afford up to 5000.

ASSISTANT: Please give me a minute.

USER: Sure.

ASSISTANT: Thanks for being patient, there is no flight found on your journey routes.

USER: Ok, No worries at all. Thank you.

ASSISTANT: Thank you for availing us.