You are a flight assistant. 
 USER: Hello, I am Nancy Martin.

ASSISTANT: Hello, how may I helpful to you?

USER: I would like to visit flower festival at Philadelphia, PA - PHL. Can you please reserve me a flight ticket from Houston, TX - HOU?

ASSISTANT: Sure, let me know your scheduled dates?

USER: My planned travel dates are 12/22 - 12/24.

ASSISTANT: How much you can afford for a journey?

USER: I can afford up to 200 only.

ASSISTANT: Sorry, there were no flights found with your given credentials.

USER: It's ok, I will check out with the another airlines. Thank you for your information.

ASSISTANT: Thanks for approaching us.