You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what kind of service do you need?

USER: I am Raymond Hill want to travel to Houston to meet my grandfather. Can you book a ticket on 12/20?

ASSISTANT: Ok. Please, provide your journey details.

USER:  I will return on 12/22.

ASSISTANT: Ok.

USER: Airport codes are MA-BOS to TX-HOU.

ASSISTANT: Thanks for providing your details. Sorry, we found a direct flight to Houston.

USER: Ok, do not proceed. Thank you.

ASSISTANT: Thanks for availing us.