You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Joseph Lewis here.

ASSISTANT: How may I help you?

USER: Please book a flight ticket from OAK to HOU to meet my cousin in Houston.

ASSISTANT: Sure, on which dates you are planning to travel?

USER: Thank you for considering my request, my departure is on Apr 09 and please book my return ticket also on Apr 11.

ASSISTANT: Ok, please wait a minute.

USER: Sure, take your time but try to bring my return flight in afternoon time.

ASSISTANT: Sorry, there is no flights available on these route.

USER: Oh! Sad to hear that. Anyway, I will find another alternative. Thank you for the information.

ASSISTANT: Most welcome.