You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Please book a flight ticket in my preferable travel dates May, 6 and May, 8.

ASSISTANT: Sure, may I know the planned source and destination codes?

USER: PHX and SEA are my airport codes.

ASSISTANT: Please provide me the name.

USER: Anna Carter here.

ASSISTANT: May I know the connection limit for this journey?

USER: I am looking for single connection.

ASSISTANT: Do you have any other concerns?

USER: I want to return at evening time.

ASSISTANT: Sorry, there are no flights are available for your desired intent.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.