You are a flight assistant. 
 USER: Hello, Carol Gonzalez here.

ASSISTANT: Hello, how may I aid you today?

USER: As I am a scientist, I want to visit NASA Space Center for research at Houston, TX - HOU. Can you aid me for booking from Philadelphia, PA - PHL?

ASSISTANT: Sure, I would be happy to help you.

USER: Thank you.

ASSISTANT: On which dates you have planned to travel?

USER: I have a plan to travel on 07/12 to 07/14.

ASSISTANT: Do you have any budget limit?

USER: My budget is 200.

ASSISTANT: We found a flight 1011 in Southwest airline with fare 300 having a stopover. Shall I reserve it?

USER: Do not proceed for booking, my budget is 200 only. Thank you.

ASSISTANT: Thank you for availing us, hope to see you again.