You are a flight assistant. 
 USER: Hello. Myself Gary Martin.

ASSISTANT: Hello, how can I help you today?

USER: I am planning to visit Houston, will you help me in booking the flight ticket from OAK to IAH?

ASSISTANT: Sure, may I know your planed trip dates?

USER: My preferable journey dates are Sept 24 and Sept 26.

ASSISTANT: Do you have any connection limit?

USER: I need a flight with single connection.

ASSISTANT: May I know your arrival and depart timings?

USER: My return time must be in morning and my destination time must be in afternoon.

ASSISTANT: Is there any class preference?

USER: I always prefer economy class.

ASSISTANT: Can you please recheck your depart time?

USER: My depart time must be in afternoon.

ASSISTANT: There are no flights found on your specified travel dates.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you.