You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Raymond Walker.

ASSISTANT: How may I help you?

USER: I am planning to visit Downtown Aquarium at Houston, could you please help me with booking a flight ticket from PHL to IAH?

ASSISTANT: May I know your travel dates?

USER: I would like to take off on 12/07 and return on 12/09.

ASSISTANT: There is a flight with flight number 1004 with price is 300, can I proceed?

USER: Can you please check a flight ticket with ticket fare 200 or less?

ASSISTANT: No, there is no flight found with your requirements.

USER: That's ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Most welcome.