You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Thomas Campbell here. I would like to travel from PHL to IAH. Could you please help me to book a ticket?

ASSISTANT: Sure, may I know your travel dates?

USER: My travelling dates will be on 09/17 to 09/19.

ASSISTANT: How much you can afford for this ticket?

USER: I can spend 200.

ASSISTANT: Sorry, there is no flight on your details.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you.