You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am planning to visit Houston, will you help me in booking the flight ticket from PHX?

ASSISTANT: Sure, I will help you with that. May I know your name to book a flight ticket?

USER: Myself Carol Green.

ASSISTANT: Carol Green, can you please help me with the airport codes?

USER: My destination airport code is HOU.

ASSISTANT: may I know your planned dates of journey?

USER: My preferable journey dates are Oct 22 and Oct 24.

ASSISTANT: Do you need stop over in between your journey?

USER: I need a flight with single connection.

ASSISTANT: Please let me know if there are any specifications.

USER: My return time must be in afternoon with normal-cost airlines.

ASSISTANT: Do you have any other specifications?

USER: No, thank you for asking.

ASSISTANT: I request you to please wait a moment while I check with the availability of the flight.

USER: Ok, I will wait for you response.

ASSISTANT: Thank you for waiting, there is no flight available on the dates provided.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.