You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Barbara Carter.

ASSISTANT: How may I assist you?

USER: Can you help me in booking from OAK to LAX?

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

USER: My planned dates are from Apr 21 to Apr 23.

ASSISTANT: Do you have any airline preferences?

USER: No.

ASSISTANT: Do you have any specifications?

USER: I want to depart in the afternoon time with a connecting flight.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Barbara Carter, no flights has been found on your requirements.

USER: Ok, Not an issue. Thank you.

ASSISTANT: Thank you for reaching us.