You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: My name is Karen Collins, I want to book a flight on Jan 26 to visit my family. Can you book a connecting flight for me?

ASSISTANT: Yes, tell me your travel dates please?

USER: I will return on Jan 28.

ASSISTANT: Now share your airport codes please?

USER: My source point is PHX and destination is OAK.

ASSISTANT: Do you have any preferences?

USER: I want my depart flight in evening.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Thanks for waiting. But I am sorry to say that there are no flights available.

USER: Ok, thank you for the information.

ASSISTANT: Thank you.