You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I want to book a flight ticket from Chicago to attend a client meeting in Phoenix, could you please help me to book a flight ticket with single connection?

ASSISTANT: Sure, I am here to help you with that, can I know your good name to proceed further?

USER: I am Helen Evans.

ASSISTANT: May I know your itinerary dates please?

USER: Sure, I intend to start my journey on 05/18 and my return date will be on 05/20.

ASSISTANT: Let me know your airport codes too.

USER: My source and destination airport codes are ORD and PHX.

ASSISTANT:  May I know your preferable journey timings?

USER: I don't have any preferable timings.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: No more requirements.

ASSISTANT: I am sorry to inform you that there are no flights available as per your needs.

USER: That's ok, I'll choose any alternative,.

ASSISTANT: Thanks for consulting us.

USER: Thank you.