You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I address you?

USER: Myself James Taylor, can you help me to book a flight ticket from AZ - PHX to Houston, TX - HOU?

ASSISTANT: Sure, may I know when are you planning to travel?

USER: Ok, please book the ticket for the date 08/02 and return date is 08/04.

ASSISTANT: Do you have any other requirements?

USER: Ok, please book a direct flight.

ASSISTANT: Ok, please wait. Thank you for waiting, we are sorry to inform you that, no flights were found based on your requirements.

USER: That is ok, thank you for the help.

ASSISTANT: Thank you for choosing us.