You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I am Joshua Anderson, can you help me to book a flight from ORD?

ASSISTANT: Sure, may I know your preferable dates to travel?

USER: My departure on 11/15 and I will return on 11/17.

ASSISTANT: Can you please share your destination airport code?

USER: I will be travelling to IAH to meet my partners.

ASSISTANT: Sorry for the inconvenience, there is no flight available on your requested dates.

USER: That is fine. Thank you for your help.

ASSISTANT: Most welcome.