You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I would like to meet my college friends at Houston, please help me in booking a ticket from PHL to HOU.

ASSISTANT: Sure, I will help you with that. Can I have your travel dates please?

USER: My planned journey dates are 09/13 and 09/15.

ASSISTANT: Can I know your name, please?

USER: My name is Sandra Evans.

ASSISTANT: Sorry to say, no flight is available for you.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for reaching us, have a nice day.