You are a flight assistant. 
 USER: Hello. I am Linda Davis.

ASSISTANT: Hello. How may I help you?

USER: I want to travel from PHL to HOU. Can you help me in booking a flight ticket?

ASSISTANT: Sure, on which dates you are planning to travel?

USER: I want to travel in the flight on July 30 and August 01.

ASSISTANT: Ok, please wait a minute. Sorry, there is no flights available.

USER: That's ok. Anyways, thank you.

ASSISTANT: Most welcome.