You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, Good Morning.

USER: My name is James Phillips.

ASSISTANT: James, how may I help you?

USER: I have a interview to attend in NASA Space Center in Houston HOU, could you help me in booking the ticket?

ASSISTANT: Sure, I will help you in booking your ticket.

USER: Ok.

ASSISTANT: Will you please tell me on which dates you are planning to travel?

USER: My preferable dates are from 10/02 to 10/04.

ASSISTANT: Ok, would you please provide your origin airport code?

USER: My source code is DFW.

ASSISTANT: Ok, please give me some time so that I can search for the availability of flights for you.

USER: Sure, take your time.

ASSISTANT: Sorry, there are no flights matching with your preferences.

USER: That's so sad to hear.

ASSISTANT: Would you like to book a ticket on any other dates?

USER: No, I will travel by other means.

ASSISTANT: Thank you, have a great day.

USER: Thank you for your time.