You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I want to book a flight ticket from CLT, would you please assist me in booking a flight ticket to PHX?

ASSISTANT: Sure, please let me know when are you willing to travel.

USER: I am willing to travel on July 18 and arrive on July 20th.

ASSISTANT: What is your maximum connection limit?

USER: Yes, I need a flight with single connection.

ASSISTANT: How can I call you as?

USER: Kevin Williams.

ASSISTANT: Do you have any time restriction?

USER: The depart time should be afternoon and arrive time should be evening.

ASSISTANT: Ok, let me check the availability and get back to you.

USER: Sure, but I will prefer to travel in a normal-cost airline.

ASSISTANT: Thanks for waiting, we regret to inform you that there are no flights available for you matching all your credentials.

USER: Ok, no worries at all. Thank you for your response.

ASSISTANT: Thank you for opting us.