You are a flight assistant. 
 USER: Hi, I am Cynthia Edwards.

ASSISTANT: Hello, how may I help you today?

USER: Please help me to book a flight ticket from PHX to meet my old friend to start a new business in IAH.

ASSISTANT: Sure, can I know your travelling dates?

USER: I intend to start on May 2nd and my return date will be on May 4th.

ASSISTANT: Do you have any class preference?

USER: No, I don't have any class preference.

ASSISTANT: Can I know your connection limit?

USER: Yes, I need a break.

ASSISTANT: Do you have any other specifications?

USER: I want to return in the evening.

ASSISTANT: Sorry, there are no flights available on your travelling dates.

USER: No issues, I'll choose any alternative to reach my destination. Thank you for your information.