You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any help from us?

USER: I would like to make a flight ticket reservation from IAH to OAK, can you please help me?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: Sure, my planned travelling dates are Jun, 30 and Jul, 02 respectively.

ASSISTANT: Ok, could I have your name please?

USER: Sure, my name is Rachel Williams here.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: Flight has to be with single connection.

ASSISTANT: Ok, do you have any other specifications?

USER: Yes, I prefer to return at evening in my journey.

ASSISTANT: Sorry, there is no flight with your requested time.

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

ASSISTANT: You are welcome, have a great day.