You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I aid you today?

USER: I am Brian Walker. I would like to visit Havasupai Adventure at Houston, can you please book me a ticket?

ASSISTANT: Sure, may I know your source and destination codes?

USER: I need to leave from my nearest airport BOS to reach IAH.

ASSISTANT: When do you want to travel?

USER: I want to travel on 12/09, and need to catch return flight on 12/11.

ASSISTANT: Sorry, there are no flights available on your travelling dates.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for availing us.