You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Gregory Walker here.

ASSISTANT: How may I assist you?

USER: I want to attend a Marriage in Phoenix. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I am here to help you with that. May I know your travelling dates please?

USER: My travelling dates are 06/19 and 06/21.

ASSISTANT: Can you please share your airport codes?

USER: My airport codes are HOU and PHX.

ASSISTANT: Do you prefer either business or economy class?

USER: It's not an issue.

ASSISTANT: Please share if you want to travel in any specific time?

USER: I want to departure on morning time.

ASSISTANT: Can you please share your airline preferences?

USER: I don't have any airline preference.

ASSISTANT: Do you have any other specifications?

USER: I want to prefer direct flight.

ASSISTANT: Wait a moment please.

USER: Ok, I will wait.

ASSISTANT: Gregory Walker, there are no flights available in your route.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us.