You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I am planning to travel from PHX to DTW, help me in booking a flight?

ASSISTANT: Sure, may I know your planned travel dates?

USER: I like to travel on Sept 18 to 20.

ASSISTANT: Do you have any limits on number of connections?

USER: I prefer travelling in single connection flight.

ASSISTANT: may I know your name for the documentation process?

USER: I am Mary Edwards.

ASSISTANT: Do you have any time preferences on your journey?

USER: No, but I want normal-cost airlines.

ASSISTANT: Please wait.

USER: Ok.

ASSISTANT: Sorry, we can not found any flight on your required dates.

USER: That's ok, thank you.

ASSISTANT: Welcome, thank you for reaching us.