You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I want to attend my son's convocation ceremony, so please book my ticket from HOU to OAK.

ASSISTANT: Sure, can I have your travel dates please?

USER: My itinerary dates are Apr 4 and Apr 6.

ASSISTANT: Can you share your connection limit?

USER: I am looking for a connecting flight.

ASSISTANT: Can I have your good name please?

USER: Gregory Hall here.

ASSISTANT: Is there any other requirements to be met?

USER: I want to depart from Houston in the evening and return from Oakland in the afternoon.

ASSISTANT: Sorry, there are no flights on your required details.

USER: No problem, I will find an alternative way to travel.

ASSISTANT: Ok. Thank you for contacting us.

USER: Thank you for assisting me.

ASSISTANT: You are welcome.