You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ronald Thompson.

ASSISTANT: How may I help you today?

USER: I am planning to visit LGA. Can you book a flight ticket from OAK?

ASSISTANT: Sure, let me know your travel dates please?

USER: I will start on Nov, 25 and return on Nov, 27.

ASSISTANT: Do you have any specific depart and arrival timings?

USER: My return time should be at morning.

ASSISTANT: Ok, is there any class preference?

USER: I need to travel in economy class only.

ASSISTANT: May I know your connection limit?

USER: I need single connection.

ASSISTANT: Do you have any airline preference?

USER: No.

ASSISTANT: Sorry to inform you that there are no flight services available on your given dates.

USER: That's ok, no worries. Thank you.

ASSISTANT: Thanks for choosing us.