You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Matthew Thompson. I need to book a ticket to meet my sister and brother after long time. Could you please help me in doing that?

ASSISTANT: Ok. Sure, may I know your dates of travel?

USER: My travelling dates are 07/25 and return on 07/27.

ASSISTANT: Please share your airport codes?

USER: My airport codes are PHX and IAH.

ASSISTANT: Ok, please wait a moment.

USER: I prefer  a direct flight.

ASSISTANT: Ok. Sorry, there is no direct flight available from your source.

USER: No issues, thank you for your information.

ASSISTANT: Thank you for availing us.