You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to visit Houston, can you book a ticket?

ASSISTANT: Sure, may I know you travel dates?

USER: My travel dates are 08/23 and 08/25.

ASSISTANT: May I know you airport codes?

USER: My codes are PHL to IAH.

ASSISTANT: May I know your name for the documentation purpose?

USER: My name is Sharon Scott.

ASSISTANT: Sorry Scott, there is no flight found as per your request.

USER: Ok, thank you for checking.

ASSISTANT: Thank you for reaching us.