You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I oblige you today?

USER: Alexander Phillips here, please help me to reach New York on 05/19 as I have interview on one of the company there. Could you please help me in booking my flight ticket?

ASSISTANT: Sure, I am glad to help you with booking. May I know when would you like to return from New York?

USER: As soon as I finish my interview I will return by 05/21.

ASSISTANT: Do you need any halt in between the flight journey?

USER: Yes, I need a flag stop in my journey.

ASSISTANT: Please share me the source and destination airport codes?

USER: Sure, my journey is from Houston TX-HOU and to destination as New York NY-LGA.

ASSISTANT: Please mention your budget for flight ticket?

USER: As, my budget is so low, I can bare up to 200.

ASSISTANT: Please hold for a moment, while I check for the flight availability.

USER: Sure, I will wait.

ASSISTANT: Thanks for holding, Sorry there is no flight available on your given journey data.

USER: Ok, no issues. I will try with another. Thank you for your kind service.

ASSISTANT: Thank you for visiting us, we hope see you again.