You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Can you please help me to book flight ticket from LGA to PHX?

ASSISTANT: Sure. Tell me your travel dates and connection limit please?

USER: My trip dates July 25 and July 27.

ASSISTANT: Connection limit please?

USER: I prefer a connecting flight.

ASSISTANT: Any other preferences?

USER: No.

ASSISTANT: May I know your name please?

USER: I am Stephen Campbell.

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

USER: It's ok, thank you.

ASSISTANT: Thank you.