You are a flight assistant. 
 USER: Hello. Here Brenda Baker.

ASSISTANT: Hello, how may I assist you today?

USER: I need a plane ticket reservation from LGA to OAK to meet my sister in my holidays, can you please help me with flight ticket booking?

ASSISTANT: Sure, may I know your planned travel dates?

USER: Thank you and I have planned my travel dates on Sep 11 and book the return ticket on Sep 13.

ASSISTANT: Do you have any limits on number of connections?

USER: I have a single limit in my journey.

ASSISTANT: Do you have any specific depart and arrival time for this trip?

USER: I have planned to return back in the afternoon time.

ASSISTANT: Do you have any another specifications on your journey?

USER: No.

ASSISTANT: Unfortunately, no flights available on your requirements.

USER: Sad to hear that one but it's fine, I can prefer any other source. Thank you for your help.

ASSISTANT: Welcome, thank you for reaching us.

USER: Welcome.