You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please help me to book a ticket from HOU to PHX?

ASSISTANT: Sure, may I know your good name?

USER: I am Gary Edwards.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Could I have your journey dates, please?

USER: I would like to depart on Aug 04 and return on Aug 06.

ASSISTANT: Is there any other specifications?

USER: I would like to depart in the morning time.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry, there are no flights available as per your requirements.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for reaching us.